22021770988 has 24 divisors (see below), whose sum is σ = 44049614112. Its totient is φ = 9436600704.

The previous prime is 22021770961. The next prime is 22021771007. The reversal of 22021770988 is 88907712022.

It is a happy number.

It is a super-2 number, since 2×22021770988² (a number of 21 digits) contains 22 as substring.

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, 168570 + ... + 269182.

It is an arithmetic number, because the mean of its divisors is an integer number (1835400588).

Almost surely, 2^22021770988 is an apocalyptic number.

22021770988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22021770988 is an abundant number, since it is smaller than the sum of its proper divisors (22027843124).

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

22021770988 is a wasteful number, since it uses less digits than its factorization.

22021770988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108441 (or 108439 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 22021770988 in words is "twenty-two billion, twenty-one million, seven hundred seventy thousand, nine hundred eighty-eight".