20121320113 has 2 divisors, whose sum is σ = 20121320114. Its totient is φ = 20121320112.

The previous prime is 20121320099. The next prime is 20121320119. The reversal of 20121320113 is 31102312102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15417692224 + 4703627889 = 124168^2 + 68583^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121320113 - 2⁵ = 20121320081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121320119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060660056 + 10060660057.

It is an arithmetic number, because the mean of its divisors is an integer number (10060660057).

Almost surely, 2^20121320113 is an apocalyptic number.

It is an amenable number.

20121320113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121320113 is an equidigital number, since it uses as much as digits as its factorization.

20121320113 is an evil number, because the sum of its binary digits is even.

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

Adding to 20121320113 its reverse (31102312102), we get a palindrome (51223632215).

The spelling of 20121320113 in words is "twenty billion, one hundred twenty-one million, three hundred twenty thousand, one hundred thirteen".