21540108 has 12 divisors (see below), whose sum is σ = 50260280. Its totient is φ = 7180032.

The previous prime is 21540083. The next prime is 21540157. The reversal of 21540108 is 80104512.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897493 + ... + 897516.

Almost surely, 2^21540108 is an apocalyptic number.

It is an amenable number.

21540108 is an abundant number, since it is smaller than the sum of its proper divisors (28720172).

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

21540108 is a wasteful number, since it uses less digits than its factorization.

21540108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795016 (or 1795014 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21540108 is about 4641.1321894555. The cubic root of 21540108 is about 278.2376898561.

The spelling of 21540108 in words is "twenty-one million, five hundred forty thousand, one hundred eight".