21274113552 has 20 divisors (see below), whose sum is σ = 54958126800. Its totient is φ = 7091371168.

The previous prime is 21274113551. The next prime is 21274113577. The reversal of 21274113552 is 25531147212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21274113551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221605302 + ... + 221605397.

It is an arithmetic number, because the mean of its divisors is an integer number (2747906340).

Almost surely, 2^21274113552 is an apocalyptic number.

It is an amenable number.

21274113552 is an abundant number, since it is smaller than the sum of its proper divisors (33684013248).

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

21274113552 is a wasteful number, since it uses less digits than its factorization.

21274113552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443210710 (or 443210704 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The spelling of 21274113552 in words is "twenty-one billion, two hundred seventy-four million, one hundred thirteen thousand, five hundred fifty-two".