22131230012221 has 4 divisors (see below), whose sum is σ = 24143160013344. Its totient is φ = 20119300011100.

The previous prime is 22131230012207. The next prime is 22131230012237. The reversal of 22131230012221 is 12221003213122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22131230012221 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22131230012192 and 22131230012201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131230012321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005965000545 + ... + 1005965000566.

It is an arithmetic number, because the mean of its divisors is an integer number (6035790003336).

Almost surely, 2^{22131230012221} is an apocalyptic number.

It is an amenable number.

22131230012221 is a deficient number, since it is larger than the sum of its proper divisors (2011930001123).

22131230012221 is a wasteful number, since it uses less digits than its factorization.

22131230012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011930001122.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 22131230012221 its reverse (12221003213122), we get a palindrome (34352233225343).

The spelling of 22131230012221 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred thirty million, twelve thousand, two hundred twenty-one".