21252958224 has 40 divisors (see below), whose sum is σ = 54913360320. Its totient is φ = 7083043968.

The previous prime is 21252958219. The next prime is 21252958271. The reversal of 21252958224 is 42285925212.

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, 251482 + ... + 325190.

It is an arithmetic number, because the mean of its divisors is an integer number (1372834008).

Almost surely, 2^21252958224 is an apocalyptic number.

21252958224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21252958224 is an abundant number, since it is smaller than the sum of its proper divisors (33660402096).

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

21252958224 is a wasteful number, since it uses less digits than its factorization.

21252958224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79727 (or 79721 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The spelling of 21252958224 in words is "twenty-one billion, two hundred fifty-two million, nine hundred fifty-eight thousand, two hundred twenty-four".