21995632 has 20 divisors (see below), whose sum is σ = 42794136. Its totient is φ = 10952000.

The previous prime is 21995621. The next prime is 21995681. The reversal of 21995632 is 23659912.

It is a junction number, because it is equal to n+sod(n) for n = 21995591 and 21995600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278 + ... + 6754.

Almost surely, 2^21995632 is an apocalyptic number.

It is an amenable number.

21995632 is a deficient number, since it is larger than the sum of its proper divisors (20798504).

21995632 is a wasteful number, since it uses less digits than its factorization.

21995632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736 (or 5730 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 21995632 is about 4689.9501063444. The cubic root of 21995632 is about 280.1853874323.

The spelling of 21995632 in words is "twenty-one million, nine hundred ninety-five thousand, six hundred thirty-two".