21056125060 has 12 divisors (see below), whose sum is σ = 44217862668. Its totient is φ = 8422450016.

The previous prime is 21056125039. The next prime is 21056125073. The reversal of 21056125060 is 6052165012.

It can be written as a sum of positive squares in 2 ways, for example, as 8551070784 + 12505054276 = 92472^2 + 111826^2 .

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, 526403107 + ... + 526403146.

It is an arithmetic number, because the mean of its divisors is an integer number (3684821889).

Almost surely, 2^21056125060 is an apocalyptic number.

21056125060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21056125060 is an abundant number, since it is smaller than the sum of its proper divisors (23161737608).

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

21056125060 is a wasteful number, since it uses less digits than its factorization.

21056125060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052806262 (or 1052806260 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21056125060 in words is "twenty-one billion, fifty-six million, one hundred twenty-five thousand, sixty".