21566375060 has 12 divisors (see below), whose sum is σ = 45289387668. Its totient is φ = 8626550016.

The previous prime is 21566375041. The next prime is 21566375071. The reversal of 21566375060 is 6057366512.

It can be written as a sum of positive squares in 2 ways, for example, as 4704313744 + 16862061316 = 68588^2 + 129854^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21566374999 and 21566375017.

It is a congruent number.

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, 539159357 + ... + 539159396.

It is an arithmetic number, because the mean of its divisors is an integer number (3774115639).

Almost surely, 2^21566375060 is an apocalyptic number.

21566375060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21566375060 is an abundant number, since it is smaller than the sum of its proper divisors (23723012608).

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

21566375060 is a wasteful number, since it uses less digits than its factorization.

21566375060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078318762 (or 1078318760 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 21566375060 in words is "twenty-one billion, five hundred sixty-six million, three hundred seventy-five thousand, sixty".