21274597220 has 12 divisors (see below), whose sum is σ = 44676654204. Its totient is φ = 8509838880.

The previous prime is 21274597207. The next prime is 21274597231. The reversal of 21274597220 is 2279547212.

It can be written as a sum of positive squares in 2 ways, for example, as 5332504576 + 15942092644 = 73024^2 + 126262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531864911 + ... + 531864950.

It is an arithmetic number, because the mean of its divisors is an integer number (3723054517).

Almost surely, 2^21274597220 is an apocalyptic number.

21274597220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21274597220 is an abundant number, since it is smaller than the sum of its proper divisors (23402056984).

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

21274597220 is a wasteful number, since it uses less digits than its factorization.

21274597220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063729870 (or 1063729868 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21274597220 in words is "twenty-one billion, two hundred seventy-four million, five hundred ninety-seven thousand, two hundred twenty".