21902466 has 16 divisors (see below), whose sum is σ = 43995744. Its totient is φ = 7269024.

The previous prime is 21902431. The next prime is 21902471. The reversal of 21902466 is 66420912.

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, 6436 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (2749734).

Almost surely, 2^21902466 is an apocalyptic number.

21902466 is an abundant number, since it is smaller than the sum of its proper divisors (22093278).

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

21902466 is a wasteful number, since it uses less digits than its factorization.

21902466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15905.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21902466 is about 4680.0070512767. The cubic root of 21902466 is about 279.7892376527.

It can be divided in two parts, 2190 and 2466, that added together give a triangular number (4656 = T₉₆).

The spelling of 21902466 in words is "twenty-one million, nine hundred two thousand, four hundred sixty-six".