22131504 has 60 divisors (see below), whose sum is σ = 65205400. Its totient is φ = 6988032.

The previous prime is 22131493. The next prime is 22131509. The reversal of 22131504 is 40513122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22131509) 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 11 ways as a sum of consecutive naturals, for example, 1309 + ... + 6780.

Almost surely, 2^22131504 is an apocalyptic number.

22131504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22131504 is an abundant number, since it is smaller than the sum of its proper divisors (43073896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22131504 is a wasteful number, since it uses less digits than its factorization.

22131504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8122 (or 8113 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22131504 is about 4704.4132471542. The cubic root of 22131504 is about 280.7611264276.

Adding to 22131504 its reverse (40513122), we get a palindrome (62644626).

The spelling of 22131504 in words is "twenty-two million, one hundred thirty-one thousand, five hundred four".