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21016831 = 1119100559
BaseRepresentation
bin101000000101…
…1000011111111
31110112202200011
41100023003333
520340014311
62030244051
7343432363
oct120130377
943482604
1021016831
1110955290
127056627
13447b1c4
142b112a3
151ca2321
hex140b0ff

21016831 has 8 divisors (see below), whose sum is σ = 24134400. Its totient is φ = 18100440.

The previous prime is 21016829. The next prime is 21016837. The reversal of 21016831 is 13861012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21016831 - 21 = 21016829 is a prime.

It is a super-2 number, since 2×210168312 = 883414370565122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50071 + ... + 50488.

It is an arithmetic number, because the mean of its divisors is an integer number (3016800).

Almost surely, 221016831 is an apocalyptic number.

21016831 is a deficient number, since it is larger than the sum of its proper divisors (3117569).

21016831 is a wasteful number, since it uses less digits than its factorization.

21016831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100589.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21016831 is about 4584.4117397982. The cubic root of 21016831 is about 275.9661050233.

Adding to 21016831 its reverse (13861012), we get a palindrome (34877843).

The spelling of 21016831 in words is "twenty-one million, sixteen thousand, eight hundred thirty-one".

Divisors: 1 11 19 209 100559 1106149 1910621 21016831