21957087222 has 48 divisors (see below), whose sum is σ = 57568167072. Its totient is φ = 5904426240.

The previous prime is 21957087197. The next prime is 21957087281. The reversal of 21957087222 is 22278075912.

21957087222 is a `hidden beast` number, since 2 + 1 + 9 + 570 + 8 + 72 + 2 + 2 = 666.

It is a super-2 number, since 2×21957087222² (a number of 21 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 23 ways as a sum of consecutive naturals, for example, 5123229 + ... + 5127512.

It is an arithmetic number, because the mean of its divisors is an integer number (1199336814).

Almost surely, 2^21957087222 is an apocalyptic number.

21957087222 is an abundant number, since it is smaller than the sum of its proper divisors (35611079850).

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

21957087222 is a wasteful number, since it uses less digits than its factorization.

21957087222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250773 (or 10250770 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 21957087222 in words is "twenty-one billion, nine hundred fifty-seven million, eighty-seven thousand, two hundred twenty-two".