21955874094 has 80 divisors (see below), whose sum is σ = 61337079936. Its totient is φ = 5702821200.

The previous prime is 21955874063. The next prime is 21955874113. The reversal of 21955874094 is 49047855912.

It is a happy number.

21955874094 is a `hidden beast` number, since 2 + 19 + 5 + 587 + 40 + 9 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21955874094.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 867592 + ... + 892539.

Almost surely, 2^21955874094 is an apocalyptic number.

21955874094 is an abundant number, since it is smaller than the sum of its proper divisors (39381205842).

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

21955874094 is a wasteful number, since it uses less digits than its factorization.

21955874094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760163 (or 1760154 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 21955874094 in words is "twenty-one billion, nine hundred fifty-five million, eight hundred seventy-four thousand, ninety-four".