21902108 has 12 divisors (see below), whose sum is σ = 38409000. Its totient is φ = 10928112.

The previous prime is 21902107. The next prime is 21902119. The reversal of 21902108 is 80120912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21902107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3491 + ... + 7482.

It is an arithmetic number, because the mean of its divisors is an integer number (3200750).

Almost surely, 2^21902108 is an apocalyptic number.

It is an amenable number.

21902108 is a deficient number, since it is larger than the sum of its proper divisors (16506892).

21902108 is a wasteful number, since it uses less digits than its factorization.

21902108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11476 (or 11474 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 21902108 is about 4679.9688033148. The cubic root of 21902108 is about 279.7877132415.

The spelling of 21902108 in words is "twenty-one million, nine hundred two thousand, one hundred eight".