21402160525 has 24 divisors (see below), whose sum is σ = 27432569600. Its totient is φ = 16546550400.

The previous prime is 21402160471. The next prime is 21402160579. The reversal of 21402160525 is 52506120412.

It is an interprime number because it is at equal distance from previous prime (21402160471) and next prime (21402160579).

It is not a de Polignac number, because 21402160525 - 2²⁷ = 21267942797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21402160493 and 21402160502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 554041 + ... + 591409.

Almost surely, 2^21402160525 is an apocalyptic number.

21402160525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21402160525 is a deficient number, since it is larger than the sum of its proper divisors (6030409075).

21402160525 is a wasteful number, since it uses less digits than its factorization.

21402160525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38149 (or 38144 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21402160525 its reverse (52506120412), we get a palindrome (73908280937).

The spelling of 21402160525 in words is "twenty-one billion, four hundred two million, one hundred sixty thousand, five hundred twenty-five".