21210012224 has 56 divisors (see below), whose sum is σ = 42607992000. Its totient is φ = 10474928640.

The previous prime is 21210012203. The next prime is 21210012269. The reversal of 21210012224 is 42221001212.

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, 1764314 + ... + 1776294.

It is an arithmetic number, because the mean of its divisors is an integer number (760857000).

Almost surely, 2^21210012224 is an apocalyptic number.

It is an amenable number.

21210012224 is an abundant number, since it is smaller than the sum of its proper divisors (21397979776).

21210012224 is a wasteful number, since it uses less digits than its factorization.

21210012224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331 (or 12321 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21210012224 its reverse (42221001212), we get a palindrome (63431013436).

The spelling of 21210012224 in words is "twenty-one billion, two hundred ten million, twelve thousand, two hundred twenty-four".