222131131221 has 4 divisors (see below), whose sum is σ = 296174841632. Its totient is φ = 148087420812.

The previous prime is 222131131153. The next prime is 222131131247. The reversal of 222131131221 is 122131131222.

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 not a de Polignac number, because 222131131221 - 2⁷ = 222131131093 is a prime.

It is a super-2 number, since 2×222131131221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222131131921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37021855201 + ... + 37021855206.

It is an arithmetic number, because the mean of its divisors is an integer number (74043710408).

Almost surely, 2^222131131221 is an apocalyptic number.

It is an amenable number.

222131131221 is a deficient number, since it is larger than the sum of its proper divisors (74043710411).

222131131221 is an equidigital number, since it uses as much as digits as its factorization.

222131131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74043710410.

The product of its digits is 288, while the sum is 21.

Adding to 222131131221 its reverse (122131131222), we get a palindrome (344262262443).

Subtracting from 222131131221 its reverse (122131131222), we obtain a palindrome (99999999999).

The spelling of 222131131221 in words is "two hundred twenty-two billion, one hundred thirty-one million, one hundred thirty-one thousand, two hundred twenty-one".