1321345231 has 8 divisors (see below), whose sum is σ = 1339027200. Its totient is φ = 1303687320.

The previous prime is 1321345189. The next prime is 1321345283. The reversal of 1321345231 is 1325431231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321345231 - 2²⁹ = 784474319 is a prime.

It is a super-2 number, since 2×1321345231² = 3491906438972886722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321345196 and 1321345205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321745231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122736 + ... + 133066.

It is an arithmetic number, because the mean of its divisors is an integer number (167378400).

Almost surely, 2^1321345231 is an apocalyptic number.

1321345231 is a deficient number, since it is larger than the sum of its proper divisors (17681969).

1321345231 is a wasteful number, since it uses less digits than its factorization.

1321345231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12029.

The product of its digits is 2160, while the sum is 25.

The square root of 1321345231 is about 36350.3126671560. The cubic root of 1321345231 is about 1097.3338269899. Note that the first 3 decimals are identical.

Adding to 1321345231 its reverse (1325431231), we get a palindrome (2646776462).

The spelling of 1321345231 in words is "one billion, three hundred twenty-one million, three hundred forty-five thousand, two hundred thirty-one".