21504614131 has 32 divisors (see below), whose sum is σ = 28900988928. Its totient is φ = 15453037440.

The previous prime is 21504614101. The next prime is 21504614137. The reversal of 21504614131 is 13141640512.

It is a cyclic number.

It is not a de Polignac number, because 21504614131 - 2¹¹ = 21504612083 is a prime.

It is a super-2 number, since 2×21504614131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21504614131.

It is not an unprimeable number, because it can be changed into a prime (21504614137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1094365 + ... + 1113841.

It is an arithmetic number, because the mean of its divisors is an integer number (903155904).

Almost surely, 2^21504614131 is an apocalyptic number.

21504614131 is a deficient number, since it is larger than the sum of its proper divisors (7396374797).

21504614131 is a wasteful number, since it uses less digits than its factorization.

21504614131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20611.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21504614131 in words is "twenty-one billion, five hundred four million, six hundred fourteen thousand, one hundred thirty-one".