21902718 has 16 divisors (see below), whose sum is σ = 44069760. Its totient is φ = 7256856.

The previous prime is 21902711. The next prime is 21902723. The reversal of 21902718 is 81720912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21902711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9928 + ... + 11931.

It is an arithmetic number, because the mean of its divisors is an integer number (2754360).

Almost surely, 2^21902718 is an apocalyptic number.

21902718 is an abundant number, since it is smaller than the sum of its proper divisors (22167042).

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

21902718 is a wasteful number, since it uses less digits than its factorization.

21902718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22031.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21902718 is about 4680.0339742357. The cubic root of 21902718 is about 279.7903106920.

The spelling of 21902718 in words is "twenty-one million, nine hundred two thousand, seven hundred eighteen".