22172881 has 4 divisors (see below), whose sum is σ = 22185892. Its totient is φ = 22159872.

The previous prime is 22172827. The next prime is 22172893. The reversal of 22172881 is 18827122.

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 11282881 + 10890000 = 3359^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 22172881 - 2¹³ = 22164689 is a prime.

It is a super-2 number, since 2×22172881² = 983273303680322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22172081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3480 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (5546473).

Almost surely, 2^22172881 is an apocalyptic number.

It is an amenable number.

22172881 is a deficient number, since it is larger than the sum of its proper divisors (13011).

22172881 is a wasteful number, since it uses less digits than its factorization.

22172881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13010.

The product of its digits is 3584, while the sum is 31.

The square root of 22172881 is about 4708.8088727405. The cubic root of 22172881 is about 280.9359875803.

The spelling of 22172881 in words is "twenty-two million, one hundred seventy-two thousand, eight hundred eighty-one".