1321131040 has 48 divisors (see below), whose sum is σ = 3256884288. Its totient is φ = 505474816.

The previous prime is 1321131029. The next prime is 1321131059. The reversal of 1321131040 is 401311231.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175822 + ... + 183181.

It is an arithmetic number, because the mean of its divisors is an integer number (67851756).

Almost surely, 2^1321131040 is an apocalyptic number.

1321131040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321131040 is an abundant number, since it is smaller than the sum of its proper divisors (1935753248).

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

1321131040 is a wasteful number, since it uses less digits than its factorization.

1321131040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359041 (or 359033 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321131040 is about 36347.3663420061. The cubic root of 1321131040 is about 1097.2745309217.

Adding to 1321131040 its reverse (401311231), we get a palindrome (1722442271).

The spelling of 1321131040 in words is "one billion, three hundred twenty-one million, one hundred thirty-one thousand, forty".