20313131213 has 2 divisors, whose sum is σ = 20313131214. Its totient is φ = 20313131212.

The previous prime is 20313131159. The next prime is 20313131219. The reversal of 20313131213 is 31213131302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18823016809 + 1490114404 = 137197^2 + 38602^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313131213 - 2¹² = 20313127117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313131219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156565606 + 10156565607.

It is an arithmetic number, because the mean of its divisors is an integer number (10156565607).

Almost surely, 2^20313131213 is an apocalyptic number.

It is an amenable number.

20313131213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313131213 is an equidigital number, since it uses as much as digits as its factorization.

20313131213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20313131213 its reverse (31213131302), we get a palindrome (51526262515).

The spelling of 20313131213 in words is "twenty billion, three hundred thirteen million, one hundred thirty-one thousand, two hundred thirteen".