1231232321 has 4 divisors (see below), whose sum is σ = 1343162544. Its totient is φ = 1119302100.

The previous prime is 1231232311. The next prime is 1231232333. The reversal of 1231232321 is 1232321321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231232321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231232293 and 1231232302.

It is not an unprimeable number, because it can be changed into a prime (1231232311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55965095 + ... + 55965116.

It is an arithmetic number, because the mean of its divisors is an integer number (335790636).

Almost surely, 2^1231232321 is an apocalyptic number.

1231232321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231232321 is a deficient number, since it is larger than the sum of its proper divisors (111930223).

1231232321 is a wasteful number, since it uses less digits than its factorization.

1231232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111930222.

The product of its digits is 432, while the sum is 20.

The square root of 1231232321 is about 35088.9202028219. The cubic root of 1231232321 is about 1071.7989712821.

Adding to 1231232321 its reverse (1232321321), we get a palindrome (2463553642).

The spelling of 1231232321 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty-one".