21224502124 has 24 divisors (see below), whose sum is σ = 42502309920. Its totient is φ = 9084792576.

The previous prime is 21224502073. The next prime is 21224502137. The reversal of 21224502124 is 42120542212.

It is a happy number.

It is a super-2 number, since 2×21224502124² (a number of 21 digits) contains 22 as substring.

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, 453229 + ... + 497860.

It is an arithmetic number, because the mean of its divisors is an integer number (1770929580).

Almost surely, 2^21224502124 is an apocalyptic number.

It is an amenable number.

21224502124 is an abundant number, since it is smaller than the sum of its proper divisors (21277807796).

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

21224502124 is a wasteful number, since it uses less digits than its factorization.

21224502124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951897 (or 951895 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The spelling of 21224502124 in words is "twenty-one billion, two hundred twenty-four million, five hundred two thousand, one hundred twenty-four".