21733313 has 12 divisors (see below), whose sum is σ = 25641792. Its totient is φ = 18363240.

The previous prime is 21733307. The next prime is 21733331. The reversal of 21733313 is 31333712.

It is a happy number.

It is not a de Polignac number, because 21733313 - 2⁴ = 21733297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21733303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356 + ... + 6602.

It is an arithmetic number, because the mean of its divisors is an integer number (2136816).

Almost surely, 2^21733313 is an apocalyptic number.

It is an amenable number.

21733313 is a deficient number, since it is larger than the sum of its proper divisors (3908479).

21733313 is an equidigital number, since it uses as much as digits as its factorization.

21733313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332 (or 6325 counting only the distinct ones).

The product of its digits is 1134, while the sum is 23.

The square root of 21733313 is about 4661.9001490808. The cubic root of 21733313 is about 279.0671035863.

The spelling of 21733313 in words is "twenty-one million, seven hundred thirty-three thousand, three hundred thirteen".