22131724 has 12 divisors (see below), whose sum is σ = 38763648. Its totient is φ = 11056400.

The previous prime is 22131721. The next prime is 22131731. The reversal of 22131724 is 42713122.

It is a junction number, because it is equal to n+sod(n) for n = 22131695 and 22131704.

It is not an unprimeable number, because it can be changed into a prime (22131721) 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, 7134 + ... + 9754.

It is an arithmetic number, because the mean of its divisors is an integer number (3230304).

Almost surely, 2^22131724 is an apocalyptic number.

It is an amenable number.

22131724 is a deficient number, since it is larger than the sum of its proper divisors (16631924).

22131724 is a wasteful number, since it uses less digits than its factorization.

22131724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736 (or 4734 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 22131724 is about 4704.4366293957. The cubic root of 22131724 is about 280.7620567341.

Adding to 22131724 its reverse (42713122), we get a palindrome (64844846).

The spelling of 22131724 in words is "twenty-two million, one hundred thirty-one thousand, seven hundred twenty-four".