21524552523 has 16 divisors (see below), whose sum is σ = 31891485600. Its totient is φ = 14348234880.

The previous prime is 21524552513. The next prime is 21524552561. The reversal of 21524552523 is 32525542512.

21524552523 is a `hidden beast` number, since 2 + 1 + 52 + 4 + 552 + 52 + 3 = 666.

It is not a de Polignac number, because 21524552523 - 2⁸ = 21524552267 is a prime.

It is a super-2 number, since 2×21524552523² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21524552513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271903 + ... + 342023.

It is an arithmetic number, because the mean of its divisors is an integer number (1993217850).

Almost surely, 2^21524552523 is an apocalyptic number.

21524552523 is a deficient number, since it is larger than the sum of its proper divisors (10366933077).

21524552523 is a wasteful number, since it uses less digits than its factorization.

21524552523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81499 (or 81493 counting only the distinct ones).

The product of its digits is 120000, while the sum is 36.

The spelling of 21524552523 in words is "twenty-one billion, five hundred twenty-four million, five hundred fifty-two thousand, five hundred twenty-three".