2131331240 has 32 divisors (see below), whose sum is σ = 4797220680. Its totient is φ = 852225792.

The previous prime is 2131331221. The next prime is 2131331243. The reversal of 2131331240 is 421331312.

It can be written as a sum of positive squares in 4 ways, for example, as 2131299556 + 31684 = 46166^2 + 178^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2131331243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127022 + ... + 142818.

Almost surely, 2^2131331240 is an apocalyptic number.

2131331240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131331240 is an abundant number, since it is smaller than the sum of its proper divisors (2665889440).

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

2131331240 is a wasteful number, since it uses less digits than its factorization.

2131331240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19181 (or 19177 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2131331240 is about 46166.3431516944. The cubic root of 2131331240 is about 1286.9163451262.

Adding to 2131331240 its reverse (421331312), we get a palindrome (2552662552).

The spelling of 2131331240 in words is "two billion, one hundred thirty-one million, three hundred thirty-one thousand, two hundred forty".