22043881 has 4 divisors (see below), whose sum is σ = 22158292. Its totient is φ = 21929472.

The previous prime is 22043851. The next prime is 22043891. The reversal of 22043881 is 18834022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2859481 + 19184400 = 1691^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 22043881 - 2¹⁵ = 22011113 is a prime.

It is a super-2 number, since 2×22043881² = 971865379084322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22043851) 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, 56916 + ... + 57301.

It is an arithmetic number, because the mean of its divisors is an integer number (5539573).

Almost surely, 2^22043881 is an apocalyptic number.

It is an amenable number.

22043881 is a deficient number, since it is larger than the sum of its proper divisors (114411).

22043881 is a wasteful number, since it uses less digits than its factorization.

22043881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114410.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 22043881 is about 4695.0911599244. The cubic root of 22043881 is about 280.3901067461.

The spelling of 22043881 in words is "twenty-two million, forty-three thousand, eight hundred eighty-one".