21566347440620 has 12 divisors (see below), whose sum is σ = 45289329625344. Its totient is φ = 8626538976240.

The previous prime is 21566347440619. The next prime is 21566347440731. The reversal of 21566347440620 is 2604474366512.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

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, 539158685996 + ... + 539158686035.

It is an arithmetic number, because the mean of its divisors is an integer number (3774110802112).

Almost surely, 2^{21566347440620} is an apocalyptic number.

21566347440620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21566347440620 is an abundant number, since it is smaller than the sum of its proper divisors (23722982184724).

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

21566347440620 is a wasteful number, since it uses less digits than its factorization.

21566347440620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078317372040 (or 1078317372038 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 50.

The spelling of 21566347440620 in words is "twenty-one trillion, five hundred sixty-six billion, three hundred forty-seven million, four hundred forty thousand, six hundred twenty".