21882361 has 4 divisors (see below), whose sum is σ = 22833792. Its totient is φ = 20930932.

The previous prime is 21882359. The next prime is 21882391. The reversal of 21882361 is 16328812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21882361 - 2¹ = 21882359 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 475681 + ... + 475726.

It is an arithmetic number, because the mean of its divisors is an integer number (5708448).

Almost surely, 2^21882361 is an apocalyptic number.

It is an amenable number.

21882361 is a deficient number, since it is larger than the sum of its proper divisors (951431).

21882361 is an equidigital number, since it uses as much as digits as its factorization.

21882361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951430.

The product of its digits is 4608, while the sum is 31.

The square root of 21882361 is about 4677.8585912787. The cubic root of 21882361 is about 279.7036021711.

The spelling of 21882361 in words is "twenty-one million, eight hundred eighty-two thousand, three hundred sixty-one".