331221211231 has 6 divisors (see below), whose sum is σ = 342250430496. Its totient is φ = 320536655100.

The previous prime is 331221211229. The next prime is 331221211259. The reversal of 331221211231 is 132112122133.

It is not a de Polignac number, because 331221211231 - 2¹ = 331221211229 is a prime.

It is a super-2 number, since 2×331221211231² (a number of 24 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 (331221211261) 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, 172330575 + ... + 172332496.

It is an arithmetic number, because the mean of its divisors is an integer number (57041738416).

Almost surely, 2^331221211231 is an apocalyptic number.

331221211231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

331221211231 is a deficient number, since it is larger than the sum of its proper divisors (11029219265).

331221211231 is an equidigital number, since it uses as much as digits as its factorization.

331221211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344663133 (or 344663102 counting only the distinct ones).

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

Adding to 331221211231 its reverse (132112122133), we get a palindrome (463333333364).

The spelling of 331221211231 in words is "three hundred thirty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-one".