21992882 has 4 divisors (see below), whose sum is σ = 32989326. Its totient is φ = 10996440.

The previous prime is 21992863. The next prime is 21992897. The reversal of 21992882 is 28829912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21335161 + 657721 = 4619^2 + 811^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5498219 + ... + 5498222.

Almost surely, 2^21992882 is an apocalyptic number.

21992882 is a deficient number, since it is larger than the sum of its proper divisors (10996444).

21992882 is a wasteful number, since it uses less digits than its factorization.

21992882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10996443.

The product of its digits is 41472, while the sum is 41.

The square root of 21992882 is about 4689.6569170889. The cubic root of 21992882 is about 280.1737102362.

The spelling of 21992882 in words is "twenty-one million, nine hundred ninety-two thousand, eight hundred eighty-two".