321231221131 has 4 divisors (see below), whose sum is σ = 325297439200. Its totient is φ = 317165003064.

The previous prime is 321231221123. The next prime is 321231221147. The reversal of 321231221131 is 131122132123.

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 321231221131 - 2³ = 321231221123 is a prime.

It is a super-2 number, since 2×321231221131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321231225131) 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, 2033108916 + ... + 2033109073.

It is an arithmetic number, because the mean of its divisors is an integer number (81324359800).

Almost surely, 2^321231221131 is an apocalyptic number.

321231221131 is a deficient number, since it is larger than the sum of its proper divisors (4066218069).

321231221131 is an equidigital number, since it uses as much as digits as its factorization.

321231221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066218068.

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

Adding to 321231221131 its reverse (131122132123), we get a palindrome (452353353254).

The spelling of 321231221131 in words is "three hundred twenty-one billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-one".