21683313 has 24 divisors (see below), whose sum is σ = 34912800. Its totient is φ = 12887424.

The previous prime is 21683297. The next prime is 21683317. The reversal of 21683313 is 31338612.

It is a happy number.

It is not a de Polignac number, because 21683313 - 2⁴ = 21683297 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683317) 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 23 ways as a sum of consecutive naturals, for example, 823 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (1454700).

Almost surely, 2^21683313 is an apocalyptic number.

It is an amenable number.

21683313 is a deficient number, since it is larger than the sum of its proper divisors (13229487).

21683313 is a wasteful number, since it uses less digits than its factorization.

21683313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7501 (or 7498 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21683313 is about 4656.5344409765. The cubic root of 21683313 is about 278.8529305437.

The spelling of 21683313 in words is "twenty-one million, six hundred eighty-three thousand, three hundred thirteen".