1231332321 has 16 divisors (see below), whose sum is σ = 1747968768. Its totient is φ = 768326400.

The previous prime is 1231332281. The next prime is 1231332337. The reversal of 1231332321 is 1232331321.

It is not a de Polignac number, because 1231332321 - 2¹¹ = 1231330273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1231332371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57465 + ... + 75926.

It is an arithmetic number, because the mean of its divisors is an integer number (109248048).

Almost surely, 2^1231332321 is an apocalyptic number.

It is an amenable number.

1231332321 is a deficient number, since it is larger than the sum of its proper divisors (516636447).

1231332321 is a wasteful number, since it uses less digits than its factorization.

1231332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133592.

The product of its digits is 648, while the sum is 21.

The square root of 1231332321 is about 35090.3451251195. The cubic root of 1231332321 is about 1071.8279874674.

Adding to 1231332321 its reverse (1232331321), we get a palindrome (2463663642).

The spelling of 1231332321 in words is "one billion, two hundred thirty-one million, three hundred thirty-two thousand, three hundred twenty-one".