21679733 has 8 divisors (see below), whose sum is σ = 22713600. Its totient is φ = 20665008.

The previous prime is 21679717. The next prime is 21679739. The reversal of 21679733 is 33797612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21679733 - 2⁴ = 21679717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21679739) 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, 2441 + ... + 7022.

It is an arithmetic number, because the mean of its divisors is an integer number (2839200).

Almost surely, 2^21679733 is an apocalyptic number.

It is an amenable number.

21679733 is a deficient number, since it is larger than the sum of its proper divisors (1033867).

21679733 is an equidigital number, since it uses as much as digits as its factorization.

21679733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9571.

The product of its digits is 47628, while the sum is 38.

The square root of 21679733 is about 4656.1500190608. The cubic root of 21679733 is about 278.8375831283.

The spelling of 21679733 in words is "twenty-one million, six hundred seventy-nine thousand, seven hundred thirty-three".