20121132313 has 4 divisors (see below), whose sum is σ = 20128454500. Its totient is φ = 20113810128.

The previous prime is 20121132257. The next prime is 20121132377. The reversal of 20121132313 is 31323112102.

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 5091107904 + 15030024409 = 71352^2 + 122597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121132313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121132013) 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, 3656970 + ... + 3662467.

It is an arithmetic number, because the mean of its divisors is an integer number (5032113625).

Almost surely, 2^20121132313 is an apocalyptic number.

It is an amenable number.

20121132313 is a deficient number, since it is larger than the sum of its proper divisors (7322187).

20121132313 is an equidigital number, since it uses as much as digits as its factorization.

20121132313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322186.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20121132313 its reverse (31323112102), we get a palindrome (51444244415).

The spelling of 20121132313 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-two thousand, three hundred thirteen".