1321311234 has 16 divisors (see below), whose sum is σ = 2643091488. Its totient is φ = 440358912.

The previous prime is 1321311227. The next prime is 1321311239. The reversal of 1321311234 is 4321131231.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321311234.

It is not an unprimeable number, because it can be changed into a prime (1321311239) 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, 24834 + ... + 57090.

It is an arithmetic number, because the mean of its divisors is an integer number (165193218).

Almost surely, 2^1321311234 is an apocalyptic number.

1321311234 is an abundant number, since it is smaller than the sum of its proper divisors (1321780254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321311234 is a wasteful number, since it uses less digits than its factorization.

1321311234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39089.

The product of its digits is 432, while the sum is 21.

The square root of 1321311234 is about 36349.8450340576. The cubic root of 1321311234 is about 1097.3244157785.

Adding to 1321311234 its reverse (4321131231), we get a palindrome (5642442465).

The spelling of 1321311234 in words is "one billion, three hundred twenty-one million, three hundred eleven thousand, two hundred thirty-four".