21627738592218 has 36 divisors (see below), whose sum is σ = 51507382961034. Its totient is φ = 6553860178800.

The previous prime is 21627738592217. The next prime is 21627738592283. The reversal of 21627738592218 is 81229583772612.

21627738592218 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 7 + 7 + 38 + 592 + 2 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14514705573489 + 7113033018729 = 3809817^2 + 2667027^2 .

It is a super-2 number, since 2×21627738592218² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21627738592217) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4965043413 + ... + 4965047768.

Almost surely, 2^{21627738592218} is an apocalyptic number.

21627738592218 is an abundant number, since it is smaller than the sum of its proper divisors (29879644368816).

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

21627738592218 is a wasteful number, since it uses less digits than its factorization.

21627738592218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9930091211 (or 9930091197 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 21627738592218 in words is "twenty-one trillion, six hundred twenty-seven billion, seven hundred thirty-eight million, five hundred ninety-two thousand, two hundred eighteen".