21923009100 has 72 divisors (see below), whose sum is σ = 70478423120. Its totient is φ = 5846135040.

The previous prime is 21923009027. The next prime is 21923009111. The reversal of 21923009100 is 190032912.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 4057117 + ... + 4062516.

Almost surely, 2^21923009100 is an apocalyptic number.

21923009100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21923009100 is an abundant number, since it is smaller than the sum of its proper divisors (48555414020).

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

21923009100 is a wasteful number, since it uses less digits than its factorization.

21923009100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8119656 (or 8119643 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 21923009100 in words is "twenty-one billion, nine hundred twenty-three million, nine thousand, one hundred".