21992113 has 32 divisors (see below), whose sum is σ = 27546624. Its totient is φ = 17424000.

The previous prime is 21992083. The next prime is 21992129. The reversal of 21992113 is 31129912.

It is not a de Polignac number, because 21992113 - 2⁵ = 21992081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21992143) 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, 536373 + ... + 536413.

It is an arithmetic number, because the mean of its divisors is an integer number (860832).

Almost surely, 2^21992113 is an apocalyptic number.

It is an amenable number.

21992113 is a deficient number, since it is larger than the sum of its proper divisors (5554511).

21992113 is a wasteful number, since it uses less digits than its factorization.

21992113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 96 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 21992113 is about 4689.5749274321. The cubic root of 21992113 is about 280.1704446934.

The spelling of 21992113 in words is "twenty-one million, nine hundred ninety-two thousand, one hundred thirteen".