22123431 has 12 divisors (see below), whose sum is σ = 34861320. Its totient is φ = 13408080.

The previous prime is 22123421. The next prime is 22123481. The reversal of 22123431 is 13432122.

It is not a de Polignac number, because 22123431 - 2⁵ = 22123399 is a prime.

It is a super-2 number, since 2×22123431² = 978892398423522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22123421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111636 + ... + 111833.

It is an arithmetic number, because the mean of its divisors is an integer number (2905110).

Almost surely, 2^22123431 is an apocalyptic number.

22123431 is a deficient number, since it is larger than the sum of its proper divisors (12737889).

22123431 is a wasteful number, since it uses less digits than its factorization.

22123431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223486 (or 223483 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 22123431 is about 4703.5551447814. Note that the first 3 decimals coincide. The cubic root of 22123431 is about 280.7269841445.

Adding to 22123431 its reverse (13432122), we get a palindrome (35555553).

The spelling of 22123431 in words is "twenty-two million, one hundred twenty-three thousand, four hundred thirty-one".