2102123131 has 4 divisors (see below), whose sum is σ = 2103161200. Its totient is φ = 2101085064.

The previous prime is 2102123063. The next prime is 2102123147. The reversal of 2102123131 is 1313212012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2102123131 - 2⁹ = 2102122619 is a prime.

It is a super-2 number, since 2×2102123131² = 8837843315770486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102123161) 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, 515991 + ... + 520048.

It is an arithmetic number, because the mean of its divisors is an integer number (525790300).

Almost surely, 2^2102123131 is an apocalyptic number.

2102123131 is a deficient number, since it is larger than the sum of its proper divisors (1038069).

2102123131 is a wasteful number, since it uses less digits than its factorization.

2102123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038068.

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

The square root of 2102123131 is about 45848.9163557875. The cubic root of 2102123131 is about 1281.0105811106.

Adding to 2102123131 its reverse (1313212012), we get a palindrome (3415335143).

The spelling of 2102123131 in words is "two billion, one hundred two million, one hundred twenty-three thousand, one hundred thirty-one".