1321323331 has 2 divisors, whose sum is σ = 1321323332. Its totient is φ = 1321323330.

The previous prime is 1321323319. The next prime is 1321323373. The reversal of 1321323331 is 1333231231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1333231231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321323331 - 2⁵ = 1321323299 is a prime.

It is a super-2 number, since 2×1321323331² = 3491790690089871122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321323301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660661665 + 660661666.

It is an arithmetic number, because the mean of its divisors is an integer number (660661666).

Almost surely, 2^1321323331 is an apocalyptic number.

1321323331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321323331 is an equidigital number, since it uses as much as digits as its factorization.

1321323331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 22.

The square root of 1321323331 is about 36350.0114305347. The cubic root of 1321323331 is about 1097.3277645461.

Adding to 1321323331 its reverse (1333231231), we get a palindrome (2654554562).

The spelling of 1321323331 in words is "one billion, three hundred twenty-one million, three hundred twenty-three thousand, three hundred thirty-one".