21504151232 has 28 divisors (see below), whose sum is σ = 43071120360. Its totient is φ = 10651585536.

The previous prime is 21504151187. The next prime is 21504151243. The reversal of 21504151232 is 23215140512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1563257 + ... + 1576952.

Almost surely, 2^21504151232 is an apocalyptic number.

It is an amenable number.

21504151232 is an abundant number, since it is smaller than the sum of its proper divisors (21566969128).

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

21504151232 is a wasteful number, since it uses less digits than its factorization.

21504151232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140328 (or 3140318 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21504151232 its reverse (23215140512), we get a palindrome (44719291744).

The spelling of 21504151232 in words is "twenty-one billion, five hundred four million, one hundred fifty-one thousand, two hundred thirty-two".