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21070206 = 2341131151
BaseRepresentation
bin101000001100…
…0000101111110
31110122110220000
41100120011332
520343221311
62031335130
7344044113
oct120300576
943573800
1021070206
11109913a3
1270814a6
1344995a1
142b2690a
151cb3056
hex141817e

21070206 has 40 divisors (see below), whose sum is σ = 47672064. Its totient is φ = 6955200.

The previous prime is 21070201. The next prime is 21070237. The reversal of 21070206 is 60207012.

It is a happy number.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17731 + ... + 18881.

Almost surely, 221070206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21070206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23836032).

21070206 is an abundant number, since it is smaller than the sum of its proper divisors (26601858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21070206 is a wasteful number, since it uses less digits than its factorization.

21070206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21070206 is about 4590.2294060319. The cubic root of 21070206 is about 276.1995249126.

Adding to 21070206 its reverse (60207012), we get a palindrome (81277218).

It can be divided in two parts, 2 and 1070206, that multiplied together give a palindrome (2140412).

The spelling of 21070206 in words is "twenty-one million, seventy thousand, two hundred six".

Divisors: 1 2 3 6 9 18 27 54 81 113 162 226 339 678 1017 1151 2034 2302 3051 3453 6102 6906 9153 10359 18306 20718 31077 62154 93231 130063 186462 260126 390189 780378 1170567 2341134 3511701 7023402 10535103 21070206