21872902 has 16 divisors (see below), whose sum is σ = 34182000. Its totient is φ = 10484320.

The previous prime is 21872891. The next prime is 21872923. The reversal of 21872902 is 20927812.

It is a congruent number.

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, 7377 + ... + 9907.

It is an arithmetic number, because the mean of its divisors is an integer number (2136375).

Almost surely, 2^21872902 is an apocalyptic number.

21872902 is a deficient number, since it is larger than the sum of its proper divisors (12309098).

21872902 is a wasteful number, since it uses less digits than its factorization.

21872902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21872902 is about 4676.8474424552. The cubic root of 21872902 is about 279.6632942463.

The spelling of 21872902 in words is "twenty-one million, eight hundred seventy-two thousand, nine hundred two".