21402160524 has 30 divisors (see below), whose sum is σ = 55949476044. Its totient is φ = 7134053400.

The previous prime is 21402160471. The next prime is 21402160579. The reversal of 21402160524 is 42506120412.

21402160524 is a `hidden beast` number, since 2 + 14 + 0 + 21 + 605 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33027702 + ... + 33028349.

Almost surely, 2^21402160524 is an apocalyptic number.

It is an amenable number.

21402160524 is an abundant number, since it is smaller than the sum of its proper divisors (34547315520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21402160524 is a wasteful number, since it uses less digits than its factorization.

21402160524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66056067 (or 66056056 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21402160524 its reverse (42506120412), we get a palindrome (63908280936).

The spelling of 21402160524 in words is "twenty-one billion, four hundred two million, one hundred sixty thousand, five hundred twenty-four".