21122220999988 has 24 divisors (see below), whose sum is σ = 37342089046080. Its totient is φ = 10453158908160.

The previous prime is 21122220999977. The next prime is 21122220999989. The reversal of 21122220999988 is 88999902222112.

It is a super-2 number, since 2×21122220999988² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122220999989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12479293 + ... + 14070436.

It is an arithmetic number, because the mean of its divisors is an integer number (1555920376920).

Almost surely, 2^{21122220999988} is an apocalyptic number.

It is an amenable number.

21122220999988 is a deficient number, since it is larger than the sum of its proper divisors (16219868046092).

21122220999988 is a wasteful number, since it uses less digits than its factorization.

21122220999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26551767 (or 26551765 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 64.

The spelling of 21122220999988 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred eighty-eight".