2131321340 has 12 divisors (see below), whose sum is σ = 4475774856. Its totient is φ = 852528528.

The previous prime is 2131321321. The next prime is 2131321343. The reversal of 2131321340 is 431231312.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 106566067 = 2131321340 / (2 + 1 + 3 + 1 + 3 + 2 + 1 + 3 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131321343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53283014 + ... + 53283053.

It is an arithmetic number, because the mean of its divisors is an integer number (372981238).

Almost surely, 2^2131321340 is an apocalyptic number.

2131321340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131321340 is an abundant number, since it is smaller than the sum of its proper divisors (2344453516).

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

2131321340 is a wasteful number, since it uses less digits than its factorization.

2131321340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106566076 (or 106566074 counting only the distinct ones).

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

The square root of 2131321340 is about 46166.2359306019. The cubic root of 2131321340 is about 1286.9143525544.

Adding to 2131321340 its reverse (431231312), we get a palindrome (2562552652).

The spelling of 2131321340 in words is "two billion, one hundred thirty-one million, three hundred twenty-one thousand, three hundred forty".