21922636 has 12 divisors (see below), whose sum is σ = 38558800. Its totient is φ = 10905840.

The previous prime is 21922619. The next prime is 21922651. The reversal of 21922636 is 63622912.

It is a junction number, because it is equal to n+sod(n) for n = 21922598 and 21922607.

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, 12975 + ... + 14566.

Almost surely, 2^21922636 is an apocalyptic number.

It is an amenable number.

21922636 is a deficient number, since it is larger than the sum of its proper divisors (16636164).

21922636 is a wasteful number, since it uses less digits than its factorization.

21922636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27744 (or 27742 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 21922636 is about 4682.1614666733. The cubic root of 21922636 is about 279.8750973528.

The spelling of 21922636 in words is "twenty-one million, nine hundred twenty-two thousand, six hundred thirty-six".