21982636 has 24 divisors (see below), whose sum is σ = 42003584. Its totient is φ = 10005120.

The previous prime is 21982621. The next prime is 21982637. The reversal of 21982636 is 63628912.

It is a junction number, because it is equal to n+sod(n) for n = 21982595 and 21982604.

It is not an unprimeable number, because it can be changed into a prime (21982637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901 + ... + 6691.

Almost surely, 2^21982636 is an apocalyptic number.

21982636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21982636 is a deficient number, since it is larger than the sum of its proper divisors (20020948).

21982636 is a wasteful number, since it uses less digits than its factorization.

21982636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881 (or 5879 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 21982636 is about 4688.5643858222. The cubic root of 21982636 is about 280.1301945547.

The spelling of 21982636 in words is "twenty-one million, nine hundred eighty-two thousand, six hundred thirty-six".