221553836311388 has 24 divisors (see below), whose sum is σ = 443188546752000. Its totient is φ = 94934313962928.

The previous prime is 221553836311361. The next prime is 221553836311459. The reversal of 221553836311388 is 883113638355122.

It is a super-2 number, since 2×221553836311388² (a number of 29 digits) contains 22 as substring.

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, 721934288 + ... + 722241111.

It is an arithmetic number, because the mean of its divisors is an integer number (18466189448000).

Almost surely, 2^{221553836311388} is an apocalyptic number.

221553836311388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221553836311388 is an abundant number, since it is smaller than the sum of its proper divisors (221634710440612).

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

221553836311388 is a wasteful number, since it uses less digits than its factorization.

221553836311388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444180889 (or 1444180887 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 59.

The spelling of 221553836311388 in words is "two hundred twenty-one trillion, five hundred fifty-three billion, eight hundred thirty-six million, three hundred eleven thousand, three hundred eighty-eight".