22121221232 has 20 divisors (see below), whose sum is σ = 46756217976. Its totient is φ = 10055100480.

The previous prime is 22121221223. The next prime is 22121221277. The reversal of 22121221232 is 23212212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62844203 + ... + 62844554.

Almost surely, 2^22121221232 is an apocalyptic number.

22121221232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22121221232 is an abundant number, since it is smaller than the sum of its proper divisors (24634996744).

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

22121221232 is a wasteful number, since it uses less digits than its factorization.

22121221232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125688776 (or 125688770 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

Adding to 22121221232 its reverse (23212212122), we get a palindrome (45333433354).

The spelling of 22121221232 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-two".