21992683 has 4 divisors (see below), whose sum is σ = 22321000. Its totient is φ = 21664368.

The previous prime is 21992657. The next prime is 21992693. The reversal of 21992683 is 38629912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21992683 - 2²¹ = 19895531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21992653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164058 + ... + 164191.

It is an arithmetic number, because the mean of its divisors is an integer number (5580250).

Almost surely, 2^21992683 is an apocalyptic number.

21992683 is a deficient number, since it is larger than the sum of its proper divisors (328317).

21992683 is an equidigital number, since it uses as much as digits as its factorization.

21992683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328316.

The product of its digits is 46656, while the sum is 40.

The square root of 21992683 is about 4689.6357001371. The cubic root of 21992683 is about 280.1728651940.

The spelling of 21992683 in words is "twenty-one million, nine hundred ninety-two thousand, six hundred eighty-three".