20102102131 has 4 divisors (see below), whose sum is σ = 20356559200. Its totient is φ = 19847645064.

The previous prime is 20102102063. The next prime is 20102102219. The reversal of 20102102131 is 13120120102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13120120102 = 2 ⋅6560060051.

It is a cyclic number.

It is not a de Polignac number, because 20102102131 - 2⁹ = 20102101619 is a prime.

It is a super-2 number, since 2×20102102131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102102431) 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, 127228416 + ... + 127228573.

It is an arithmetic number, because the mean of its divisors is an integer number (5089139800).

Almost surely, 2^20102102131 is an apocalyptic number.

20102102131 is a deficient number, since it is larger than the sum of its proper divisors (254457069).

20102102131 is an equidigital number, since it uses as much as digits as its factorization.

20102102131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254457068.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20102102131 its reverse (13120120102), we get a palindrome (33222222233).

The spelling of 20102102131 in words is "twenty billion, one hundred two million, one hundred two thousand, one hundred thirty-one".