1321232311 has 16 divisors (see below), whose sum is σ = 1523833344. Its totient is φ = 1122143904.

The previous prime is 1321232303. The next prime is 1321232321. The reversal of 1321232311 is 1132321231.

It is not a de Polignac number, because 1321232311 - 2³ = 1321232303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321232321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360856 + ... + 364498.

It is an arithmetic number, because the mean of its divisors is an integer number (95239584).

Almost surely, 2^1321232311 is an apocalyptic number.

1321232311 is a deficient number, since it is larger than the sum of its proper divisors (202601033).

1321232311 is a wasteful number, since it uses less digits than its factorization.

1321232311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110.

The product of its digits is 216, while the sum is 19.

The square root of 1321232311 is about 36348.7594148686. The cubic root of 1321232311 is about 1097.3025673153.

Adding to 1321232311 its reverse (1132321231), we get a palindrome (2453553542).

The spelling of 1321232311 in words is "one billion, three hundred twenty-one million, two hundred thirty-two thousand, three hundred eleven".