21655556943708 has 24 divisors (see below), whose sum is σ = 53189087230720. Its totient is φ = 6838596929520.

The previous prime is 21655556943677. The next prime is 21655556943743. The reversal of 21655556943708 is 80734965555612.

It is a super-3 number, since 3×21655556943708³ (a number of 41 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

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, 47490256228 + ... + 47490256683.

It is a 1-persistent number, because it is pandigital, but 2⋅21655556943708 = 43311113887416 is not.

Almost surely, 2^{21655556943708} is an apocalyptic number.

It is an amenable number.

21655556943708 is an abundant number, since it is smaller than the sum of its proper divisors (31533530287012).

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

21655556943708 is a wasteful number, since it uses less digits than its factorization.

21655556943708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94980512937 (or 94980512935 counting only the distinct ones).

The product of its (nonzero) digits is 272160000, while the sum is 66.

The spelling of 21655556943708 in words is "twenty-one trillion, six hundred fifty-five billion, five hundred fifty-six million, nine hundred forty-three thousand, seven hundred eight".