21995236 has 24 divisors (see below), whose sum is σ = 40783680. Its totient is φ = 10350432.

The previous prime is 21995209. The next prime is 21995243. The reversal of 21995236 is 63259912.

It is a junction number, because it is equal to n+sod(n) for n = 21995195 and 21995204.

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, 11826 + ... + 13558.

It is an arithmetic number, because the mean of its divisors is an integer number (1699320).

Almost surely, 2^21995236 is an apocalyptic number.

It is an amenable number.

21995236 is a deficient number, since it is larger than the sum of its proper divisors (18788444).

21995236 is a wasteful number, since it uses less digits than its factorization.

21995236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1921 counting only the distinct ones).

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

The square root of 21995236 is about 4689.9078882213. The cubic root of 21995236 is about 280.1837059761.

The spelling of 21995236 in words is "twenty-one million, nine hundred ninety-five thousand, two hundred thirty-six".