21556360160 has 48 divisors (see below), whose sum is σ = 51016618800. Its totient is φ = 8607353856.

The previous prime is 21556360157. The next prime is 21556360193. The reversal of 21556360160 is 6106365512.

It is a self number, because there is not a number n which added to its sum of digits gives 21556360160.

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, 27350 + ... + 209429.

It is an arithmetic number, because the mean of its divisors is an integer number (1062846225).

Almost surely, 2^21556360160 is an apocalyptic number.

21556360160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21556360160 is an abundant number, since it is smaller than the sum of its proper divisors (29460258640).

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

21556360160 is a wasteful number, since it uses less digits than its factorization.

21556360160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237363 (or 237355 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21556360160 in words is "twenty-one billion, five hundred fifty-six million, three hundred sixty thousand, one hundred sixty".