22131221332 has 48 divisors (see below), whose sum is σ = 42749683200. Its totient is φ = 9941499360.

The previous prime is 22131221317. The next prime is 22131221347. The reversal of 22131221332 is 23312213122.

It is an interprime number because it is at equal distance from previous prime (22131221317) and next prime (22131221347).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275169 + ... + 1292407.

It is an arithmetic number, because the mean of its divisors is an integer number (890618400).

Almost surely, 2^22131221332 is an apocalyptic number.

22131221332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22131221332 is a deficient number, since it is larger than the sum of its proper divisors (20618461868).

22131221332 is a wasteful number, since it uses less digits than its factorization.

22131221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17596 (or 17594 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 22131221332 its reverse (23312213122), we get a palindrome (45443434454).

The spelling of 22131221332 in words is "twenty-two billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-two".