21731883 has 12 divisors (see below), whose sum is σ = 29489448. Its totient is φ = 14235520.

The previous prime is 21731869. The next prime is 21731891. The reversal of 21731883 is 38813712.

It is not a de Polignac number, because 21731883 - 2⁵ = 21731851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21731833) 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 11 ways as a sum of consecutive naturals, for example, 9403 + ... + 11483.

It is an arithmetic number, because the mean of its divisors is an integer number (2457454).

Almost surely, 2^21731883 is an apocalyptic number.

21731883 is a deficient number, since it is larger than the sum of its proper divisors (7757565).

21731883 is an equidigital number, since it uses as much as digits as its factorization.

21731883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202 (or 2143 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 21731883 is about 4661.7467756196. The cubic root of 21731883 is about 279.0609828028.

The spelling of 21731883 in words is "twenty-one million, seven hundred thirty-one thousand, eight hundred eighty-three".