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21415131 = 331017853
BaseRepresentation
bin101000110110…
…0010011011011
31111022000001000
41101230103123
520440241011
62043000043
7350011533
oct121542333
944260030
1021415131
11110a7561
127209023
13458a59a
142bb64c3
151d30356
hex146c4db

21415131 has 16 divisors (see below), whose sum is σ = 32044320. Its totient is φ = 14133600.

The previous prime is 21415129. The next prime is 21415133. The reversal of 21415131 is 13151412.

It is an interprime number because it is at equal distance from previous prime (21415129) and next prime (21415133).

It is not a de Polignac number, because 21415131 - 21 = 21415129 is a prime.

It is a super-2 number, since 2×214151312 = 917215671494322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21415133) 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 15 ways as a sum of consecutive naturals, for example, 1200 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (2002770).

Almost surely, 221415131 is an apocalyptic number.

21415131 is a deficient number, since it is larger than the sum of its proper divisors (10629189).

21415131 is a wasteful number, since it uses less digits than its factorization.

21415131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7963 (or 7957 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21415131 is about 4627.6485389450. The cubic root of 21415131 is about 277.6985284977.

Adding to 21415131 its reverse (13151412), we get a palindrome (34566543).

The spelling of 21415131 in words is "twenty-one million, four hundred fifteen thousand, one hundred thirty-one".

Divisors: 1 3 9 27 101 303 909 2727 7853 23559 70677 212031 793153 2379459 7138377 21415131