21652556566140 has 72 divisors (see below), whose sum is σ = 65693330456208. Its totient is φ = 5772792326400.

The previous prime is 21652556566021. The next prime is 21652556566183. The reversal of 21652556566140 is 4166565525612.

21652556566140 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 2 + 5 + 565 + 66 + 14 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11884561 + ... + 13584840.

Almost surely, 2^{21652556566140} is an apocalyptic number.

21652556566140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21652556566140 is an abundant number, since it is smaller than the sum of its proper divisors (44040773890068).

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

21652556566140 is a wasteful number, since it uses less digits than its factorization.

21652556566140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25474139 (or 25474134 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 21652556566140 in words is "twenty-one trillion, six hundred fifty-two billion, five hundred fifty-six million, five hundred sixty-six thousand, one hundred forty".