1321312044 has 48 divisors (see below), whose sum is σ = 3333240288. Its totient is φ = 404963328.

The previous prime is 1321312009. The next prime is 1321312049. The reversal of 1321312044 is 4402131231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321312044.

It is not an unprimeable number, because it can be changed into a prime (1321312049) 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, 23614 + ... + 56570.

It is an arithmetic number, because the mean of its divisors is an integer number (69442506).

Almost surely, 2^1321312044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321312044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1666620144).

1321312044 is an abundant number, since it is smaller than the sum of its proper divisors (2011928244).

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

1321312044 is a wasteful number, since it uses less digits than its factorization.

1321312044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33234 (or 33232 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1321312044 is about 36349.8561757815. The cubic root of 1321312044 is about 1097.3246400084.

Adding to 1321312044 its reverse (4402131231), we get a palindrome (5723443275).

The spelling of 1321312044 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, forty-four".