1321233221331 has 20 divisors (see below), whose sum is σ = 1979920274112. Its totient is φ = 878043511728.

The previous prime is 1321233221303. The next prime is 1321233221377. The reversal of 1321233221331 is 1331223321231.

1321233221331 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 2 + 3 + 322 + 1 + 331 = 666.

It is not a de Polignac number, because 1321233221331 - 2⁵ = 1321233221299 is a prime.

It is a super-2 number, since 2×1321233221331² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1321233221295 and 1321233221304.

It is not an unprimeable number, because it can be changed into a prime (1321233226331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25702275 + ... + 25753628.

Almost surely, 2^{1321233221331} is an apocalyptic number.

1321233221331 is a deficient number, since it is larger than the sum of its proper divisors (658687052781).

1321233221331 is an equidigital number, since it uses as much as digits as its factorization.

1321233221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51456232 (or 51456223 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

Adding to 1321233221331 its reverse (1331223321231), we get a palindrome (2652456542562).

It can be divided in two parts, 1321233 and 221331, that added together give a square (1542564 = 1242²).

The spelling of 1321233221331 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, three hundred thirty-one".