21989192 has 16 divisors (see below), whose sum is σ = 42651900. Its totient is φ = 10615360.

The previous prime is 21989183. The next prime is 21989203. The reversal of 21989192 is 29198912.

It can be written as a sum of positive squares in 2 ways, for example, as 21659716 + 329476 = 4654^2 + 574^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47159 + ... + 47622.

Almost surely, 2^21989192 is an apocalyptic number.

It is an amenable number.

21989192 is a deficient number, since it is larger than the sum of its proper divisors (20662708).

21989192 is a wasteful number, since it uses less digits than its factorization.

21989192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94816 (or 94812 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 21989192 is about 4689.2634816141. The cubic root of 21989192 is about 280.1580400326.

The spelling of 21989192 in words is "twenty-one million, nine hundred eighty-nine thousand, one hundred ninety-two".