22131236656 has 40 divisors (see below), whose sum is σ = 43012313504. Its totient is φ = 11031344640.

The previous prime is 22131236653. The next prime is 22131236657. The reversal of 22131236656 is 65663213122.

It is not an unprimeable number, because it can be changed into a prime (22131236653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13355380 + ... + 13357036.

Almost surely, 2^22131236656 is an apocalyptic number.

It is an amenable number.

22131236656 is a deficient number, since it is larger than the sum of its proper divisors (20881076848).

22131236656 is a wasteful number, since it uses less digits than its factorization.

22131236656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749 (or 3743 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

Adding to 22131236656 its reverse (65663213122), we get a palindrome (87794449778).

The spelling of 22131236656 in words is "twenty-two billion, one hundred thirty-one million, two hundred thirty-six thousand, six hundred fifty-six".