331221131233 has 4 divisors (see below), whose sum is σ = 331225343748. Its totient is φ = 331216918720.

The previous prime is 331221131231. The next prime is 331221131243. The reversal of 331221131233 is 332131122133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332131122133 = 23 ⋅14440483571.

It can be written as a sum of positive squares in 2 ways, for example, as 246197569489 + 85023561744 = 496183^2 + 291588^2 .

It is a cyclic number.

It is not a de Polignac number, because 331221131233 - 2¹ = 331221131231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331221131198 and 331221131207.

It is not an unprimeable number, because it can be changed into a prime (331221131231) 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, 1986028 + ... + 2146333.

It is an arithmetic number, because the mean of its divisors is an integer number (82806335937).

Almost surely, 2^331221131233 is an apocalyptic number.

It is an amenable number.

331221131233 is a deficient number, since it is larger than the sum of its proper divisors (4212515).

331221131233 is an equidigital number, since it uses as much as digits as its factorization.

331221131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4212514.

The product of its digits is 1944, while the sum is 25.

Adding to 331221131233 its reverse (332131122133), we get a palindrome (663352253366).

The spelling of 331221131233 in words is "three hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-three".