21882371 has 16 divisors (see below), whose sum is σ = 25766400. Its totient is φ = 18574920.

The previous prime is 21882359. The next prime is 21882391. The reversal of 21882371 is 17328812.

It is not a de Polignac number, because 21882371 - 2¹⁸ = 21620227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21882331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44690 + ... + 45176.

It is an arithmetic number, because the mean of its divisors is an integer number (1610400).

Almost surely, 2^21882371 is an apocalyptic number.

21882371 is a deficient number, since it is larger than the sum of its proper divisors (3884029).

21882371 is an equidigital number, since it uses as much as digits as its factorization.

21882371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 625 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 21882371 is about 4677.8596601437. The cubic root of 21882371 is about 279.7036447782.

The spelling of 21882371 in words is "twenty-one million, eight hundred eighty-two thousand, three hundred seventy-one".