22131231320 has 32 divisors (see below), whose sum is σ = 54322114320. Its totient is φ = 8047720320.

The previous prime is 22131231313. The next prime is 22131231341. The reversal of 22131231320 is 2313213122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22131231292 and 22131231301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25148687 + ... + 25149566.

Almost surely, 2^22131231320 is an apocalyptic number.

22131231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131231320 is an abundant number, since it is smaller than the sum of its proper divisors (32190883000).

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

22131231320 is a wasteful number, since it uses less digits than its factorization.

22131231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50298275 (or 50298271 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 22131231320 its reverse (2313213122), we get a palindrome (24444444442).

The spelling of 22131231320 in words is "twenty-two billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty".