21122983 has 4 divisors (see below), whose sum is σ = 24140560. Its totient is φ = 18105408.

The previous prime is 21122971. The next prime is 21123013. The reversal of 21122983 is 38922112.

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 21122983 - 2⁵ = 21122951 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 (21122923) 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 3 ways as a sum of consecutive naturals, for example, 1508778 + ... + 1508791.

It is an arithmetic number, because the mean of its divisors is an integer number (6035140).

Almost surely, 2^21122983 is an apocalyptic number.

21122983 is a deficient number, since it is larger than the sum of its proper divisors (3017577).

21122983 is an equidigital number, since it uses as much as digits as its factorization.

21122983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017576.

The product of its digits is 1728, while the sum is 28.

The square root of 21122983 is about 4595.9746518013. The cubic root of 21122983 is about 276.4299423457.

The spelling of 21122983 in words is "twenty-one million, one hundred twenty-two thousand, nine hundred eighty-three".