20102131013 has 4 divisors (see below), whose sum is σ = 20137460460. Its totient is φ = 20066801568.

The previous prime is 20102131003. The next prime is 20102131111. The reversal of 20102131013 is 31013120102.

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 4797224644 + 15304906369 = 69262^2 + 123713^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102131013 - 2⁸ = 20102130757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102131003) 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 in 3 ways as a sum of consecutive naturals, for example, 17663870 + ... + 17665007.

It is an arithmetic number, because the mean of its divisors is an integer number (5034365115).

Almost surely, 2^20102131013 is an apocalyptic number.

It is an amenable number.

20102131013 is a deficient number, since it is larger than the sum of its proper divisors (35329447).

20102131013 is an equidigital number, since it uses as much as digits as its factorization.

20102131013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35329446.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20102131013 its reverse (31013120102), we get a palindrome (51115251115).

The spelling of 20102131013 in words is "twenty billion, one hundred two million, one hundred thirty-one thousand, thirteen".