22131644 has 12 divisors (see below), whose sum is σ = 39979968. Its totient is φ = 10708800.

The previous prime is 22131643. The next prime is 22131647. The reversal of 22131644 is 44613122.

It is a super-2 number, since 2×22131644² = 979619332285472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131643) 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, 89117 + ... + 89364.

It is an arithmetic number, because the mean of its divisors is an integer number (3331664).

Almost surely, 2^22131644 is an apocalyptic number.

It is an amenable number.

22131644 is a deficient number, since it is larger than the sum of its proper divisors (17848324).

22131644 is a wasteful number, since it uses less digits than its factorization.

22131644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178516 (or 178514 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 22131644 is about 4704.4281267759. The cubic root of 22131644 is about 280.7617184416.

Adding to 22131644 its reverse (44613122), we get a palindrome (66744766).

The spelling of 22131644 in words is "twenty-two million, one hundred thirty-one thousand, six hundred forty-four".