21274238220 has 48 divisors (see below), whose sum is σ = 59613871968. Its totient is φ = 5668748800.

The previous prime is 21274238191. The next prime is 21274238239. The reversal of 21274238220 is 2283247212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58209 + ... + 214328.

It is an arithmetic number, because the mean of its divisors is an integer number (1241955666).

Almost surely, 2^21274238220 is an apocalyptic number.

21274238220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21274238220 is an abundant number, since it is smaller than the sum of its proper divisors (38339633748).

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

21274238220 is a wasteful number, since it uses less digits than its factorization.

21274238220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273850 (or 273848 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The spelling of 21274238220 in words is "twenty-one billion, two hundred seventy-four million, two hundred thirty-eight thousand, two hundred twenty".