2012131321 has 4 divisors (see below), whose sum is σ = 2012307444. Its totient is φ = 2011955200.

The previous prime is 2012131301. The next prime is 2012131349. The reversal of 2012131321 is 1231312102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1895383296 + 116748025 = 43536^2 + 10805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012131321 - 2²⁷ = 1877913593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012131295 and 2012131304.

It is not an unprimeable number, because it can be changed into a prime (2012131301) 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, 69640 + ... + 94201.

It is an arithmetic number, because the mean of its divisors is an integer number (503076861).

Almost surely, 2^2012131321 is an apocalyptic number.

It is an amenable number.

2012131321 is a deficient number, since it is larger than the sum of its proper divisors (176123).

2012131321 is a wasteful number, since it uses less digits than its factorization.

2012131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176122.

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

The square root of 2012131321 is about 44856.7867886232. The cubic root of 2012131321 is about 1262.4633343729.

Adding to 2012131321 its reverse (1231312102), we get a palindrome (3243443423).

The spelling of 2012131321 in words is "two billion, twelve million, one hundred thirty-one thousand, three hundred twenty-one".