1321113440 has 48 divisors (see below), whose sum is σ = 3125612448. Its totient is φ = 527686656.

The previous prime is 1321113421. The next prime is 1321113449. The reversal of 1321113440 is 443111231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321113449) 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 7 ways as a sum of consecutive naturals, for example, 113324 + ... + 124436.

It is an arithmetic number, because the mean of its divisors is an integer number (65116926).

Almost surely, 2^1321113440 is an apocalyptic number.

1321113440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321113440 is an abundant number, since it is smaller than the sum of its proper divisors (1804499008).

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

1321113440 is a wasteful number, since it uses less digits than its factorization.

1321113440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11871 (or 11863 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1321113440 is about 36347.1242328743. The cubic root of 1321113440 is about 1097.2696582994.

Adding to 1321113440 its reverse (443111231), we get a palindrome (1764224671).

The spelling of 1321113440 in words is "one billion, three hundred twenty-one million, one hundred thirteen thousand, four hundred forty".