22131320312421 has 6 divisors (see below), whose sum is σ = 31967462673510. Its totient is φ = 14754213541608.

The previous prime is 22131320312369. The next prime is 22131320312441. The reversal of 22131320312421 is 12421302313122.

22131320312421 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 1 + 320 + 312 + 4 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22126571724321 + 4748588100 = 4703889^2 + 68910^2 .

It is not a de Polignac number, because 22131320312421 - 2⁷ = 22131320312293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131320312441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1229517795126 + ... + 1229517795143.

It is an arithmetic number, because the mean of its divisors is an integer number (5327910445585).

Almost surely, 2^{22131320312421} is an apocalyptic number.

It is an amenable number.

22131320312421 is a deficient number, since it is larger than the sum of its proper divisors (9836142361089).

22131320312421 is a wasteful number, since it uses less digits than its factorization.

22131320312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459035590275 (or 2459035590272 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 22131320312421 its reverse (12421302313122), we get a palindrome (34552622625543).

The spelling of 22131320312421 in words is "twenty-two trillion, one hundred thirty-one billion, three hundred twenty million, three hundred twelve thousand, four hundred twenty-one".