21682633 has 32 divisors (see below), whose sum is σ = 27855360. Its totient is φ = 16450560.

The previous prime is 21682627. The next prime is 21682643. The reversal of 21682633 is 33628612.

It is not a de Polignac number, because 21682633 - 2¹⁷ = 21551561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21682595 and 21682604.

It is not an unprimeable number, because it can be changed into a prime (21682613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210460 + ... + 210562.

It is an arithmetic number, because the mean of its divisors is an integer number (870480).

Almost surely, 2^21682633 is an apocalyptic number.

It is an amenable number.

21682633 is a deficient number, since it is larger than the sum of its proper divisors (6172727).

21682633 is a wasteful number, since it uses less digits than its factorization.

21682633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

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

The square root of 21682633 is about 4656.4614247302. The cubic root of 21682633 is about 278.8500155221.

The spelling of 21682633 in words is "twenty-one million, six hundred eighty-two thousand, six hundred thirty-three".