21255122360 has 32 divisors (see below), whose sum is σ = 47828359440. Its totient is φ = 8501278464.

The previous prime is 21255122327. The next prime is 21255122417. The reversal of 21255122360 is 6322155212.

It is a congruent number.

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, 669404 + ... + 700436.

Almost surely, 2^21255122360 is an apocalyptic number.

21255122360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21255122360 is an abundant number, since it is smaller than the sum of its proper divisors (26573237080).

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

21255122360 is a wasteful number, since it uses less digits than its factorization.

21255122360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48167 (or 48163 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21255122360 its reverse (6322155212), we get a palindrome (27577277572).

The spelling of 21255122360 in words is "twenty-one billion, two hundred fifty-five million, one hundred twenty-two thousand, three hundred sixty".