22131221352128 has 56 divisors (see below), whose sum is σ = 50825770636800. Its totient is φ = 9364748260608.

The previous prime is 22131221352127. The next prime is 22131221352131. The reversal of 22131221352128 is 82125312213122.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (22131221352127) 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, 312623138 + ... + 312693921.

Almost surely, 2^{22131221352128} is an apocalyptic number.

22131221352128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22131221352128 is an abundant number, since it is smaller than the sum of its proper divisors (28694549284672).

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

22131221352128 is an equidigital number, since it uses as much as digits as its factorization.

22131221352128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625317157 (or 625317147 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The spelling of 22131221352128 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred twenty-one million, three hundred fifty-two thousand, one hundred twenty-eight".