21633682 has 16 divisors (see below), whose sum is σ = 37356480. Its totient is φ = 9204048.

The previous prime is 21633679. The next prime is 21633683. The reversal of 21633682 is 28633612.

It is not an unprimeable number, because it can be changed into a prime (21633683) 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, 3613 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (2334780).

Almost surely, 2^21633682 is an apocalyptic number.

21633682 is a deficient number, since it is larger than the sum of its proper divisors (15722798).

21633682 is a wasteful number, since it uses less digits than its factorization.

21633682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11265.

The product of its digits is 10368, while the sum is 31.

The square root of 21633682 is about 4651.2022101818. The cubic root of 21633682 is about 278.6400122422.

The spelling of 21633682 in words is "twenty-one million, six hundred thirty-three thousand, six hundred eighty-two".