21254725288 has 32 divisors (see below), whose sum is σ = 42540984000. Its totient is φ = 9926219520.

The previous prime is 21254725243. The next prime is 21254725313. The reversal of 21254725288 is 88252745212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973953 + ... + 995536.

It is an arithmetic number, because the mean of its divisors is an integer number (1329405750).

Almost surely, 2^21254725288 is an apocalyptic number.

It is an amenable number.

21254725288 is an abundant number, since it is smaller than the sum of its proper divisors (21286258712).

21254725288 is a wasteful number, since it uses less digits than its factorization.

21254725288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969585 (or 1969581 counting only the distinct ones).

The product of its digits is 716800, while the sum is 46.

The spelling of 21254725288 in words is "twenty-one billion, two hundred fifty-four million, seven hundred twenty-five thousand, two hundred eighty-eight".