21899962 has 12 divisors (see below), whose sum is σ = 38213370. Its totient is φ = 9385656.

The previous prime is 21899939. The next prime is 21899987. The reversal of 21899962 is 26999812.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 1640961 = 4501^2 + 1281^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111637 + ... + 111832.

Almost surely, 2^21899962 is an apocalyptic number.

21899962 is a deficient number, since it is larger than the sum of its proper divisors (16313408).

21899962 is a wasteful number, since it uses less digits than its factorization.

21899962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223485 (or 223478 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 21899962 is about 4679.7395226658. The cubic root of 21899962 is about 279.7785749424.

The spelling of 21899962 in words is "twenty-one million, eight hundred ninety-nine thousand, nine hundred sixty-two".