22131988 has 12 divisors (see below), whose sum is σ = 40066740. Its totient is φ = 10684352.

The previous prime is 22131983. The next prime is 22132027. The reversal of 22131988 is 88913122.

It can be written as a sum of positive squares in 2 ways, for example, as 15225604 + 6906384 = 3902^2 + 2628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131983) 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, 95281 + ... + 95512.

It is an arithmetic number, because the mean of its divisors is an integer number (3338895).

Almost surely, 2^22131988 is an apocalyptic number.

It is an amenable number.

22131988 is a deficient number, since it is larger than the sum of its proper divisors (17934752).

22131988 is a wasteful number, since it uses less digits than its factorization.

22131988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190826 (or 190824 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 22131988 is about 4704.4646879321. The cubic root of 22131988 is about 280.7631730937.

The spelling of 22131988 in words is "twenty-two million, one hundred thirty-one thousand, nine hundred eighty-eight".