1321312140 has 72 divisors (see below), whose sum is σ = 4010964048. Its totient is φ = 352087680.

The previous prime is 1321312103. The next prime is 1321312141. The reversal of 1321312140 is 412131231.

It is a super-2 number, since 2×1321312140² = 3491731542622759200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1321312141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 427039 + ... + 430121.

It is an arithmetic number, because the mean of its divisors is an integer number (55707834).

Almost surely, 2^1321312140 is an apocalyptic number.

1321312140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321312140 is an abundant number, since it is smaller than the sum of its proper divisors (2689651908).

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

1321312140 is a wasteful number, since it uses less digits than its factorization.

1321312140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479 (or 5474 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1321312140 is about 36349.8574962819. The cubic root of 1321312140 is about 1097.3246665838.

Adding to 1321312140 its reverse (412131231), we get a palindrome (1733443371).

The spelling of 1321312140 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, one hundred forty".