221322311131 has 4 divisors (see below), whose sum is σ = 221979054232. Its totient is φ = 220665568032.

The previous prime is 221322311087. The next prime is 221322311137. The reversal of 221322311131 is 131113223122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221322311131 - 2¹¹ = 221322309083 is a prime.

It is a super-2 number, since 2×221322311131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221322311137) 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, 328371045 + ... + 328371718.

It is an arithmetic number, because the mean of its divisors is an integer number (55494763558).

Almost surely, 2^221322311131 is an apocalyptic number.

221322311131 is a deficient number, since it is larger than the sum of its proper divisors (656743101).

221322311131 is an equidigital number, since it uses as much as digits as its factorization.

221322311131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656743100.

The product of its digits is 432, while the sum is 22.

Adding to 221322311131 its reverse (131113223122), we get a palindrome (352435534253).

The spelling of 221322311131 in words is "two hundred twenty-one billion, three hundred twenty-two million, three hundred eleven thousand, one hundred thirty-one".