21908590146 has 24 divisors (see below), whose sum is σ = 48751548924. Its totient is φ = 7105488480.

The previous prime is 21908590141. The next prime is 21908590147. The reversal of 21908590146 is 64109580912.

21908590146 is a `hidden beast` number, since 2 + 19 + 0 + 8 + 590 + 1 + 46 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21907256121 + 1334025 = 148011^2 + 1155^2 .

It is not an unprimeable number, because it can be changed into a prime (21908590141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16447225 + ... + 16448556.

Almost surely, 2^21908590146 is an apocalyptic number.

21908590146 is an abundant number, since it is smaller than the sum of its proper divisors (26842958778).

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

21908590146 is a wasteful number, since it uses less digits than its factorization.

21908590146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32895826 (or 32895823 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 21908590146 in words is "twenty-one billion, nine hundred eight million, five hundred ninety thousand, one hundred forty-six".