1321334140 has 96 divisors (see below), whose sum is σ = 3233793024. Its totient is φ = 444165120.

The previous prime is 1321334093. The next prime is 1321334159. The reversal of 1321334140 is 414331231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3051364 + ... + 3051796.

It is an arithmetic number, because the mean of its divisors is an integer number (33685344).

Almost surely, 2^1321334140 is an apocalyptic number.

1321334140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321334140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616896512).

1321334140 is an abundant number, since it is smaller than the sum of its proper divisors (1912458884).

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

1321334140 is a wasteful number, since it uses less digits than its factorization.

1321334140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1321334140 is about 36350.1601096887. The cubic root of 1321334140 is about 1097.3307567442.

Adding to 1321334140 its reverse (414331231), we get a palindrome (1735665371).

The spelling of 1321334140 in words is "one billion, three hundred twenty-one million, three hundred thirty-four thousand, one hundred forty".