21975108 has 24 divisors (see below), whose sum is σ = 51428160. Its totient is φ = 7303200.

The previous prime is 21975091. The next prime is 21975113. The reversal of 21975108 is 80157912.

It is a super-2 number, since 2×21975108² = 965810743223328, which 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, 1758 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (2142840).

Almost surely, 2^21975108 is an apocalyptic number.

It is an amenable number.

21975108 is an abundant number, since it is smaller than the sum of its proper divisors (29453052).

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

21975108 is a wasteful number, since it uses less digits than its factorization.

21975108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5467 (or 5465 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 21975108 is about 4687.7615127052. The cubic root of 21975108 is about 280.0982138454.

The spelling of 21975108 in words is "twenty-one million, nine hundred seventy-five thousand, one hundred eight".