113425212121 has 4 divisors (see below), whose sum is σ = 122150228452. Its totient is φ = 104700195792.

The previous prime is 113425212097. The next prime is 113425212163. The reversal of 113425212121 is 121212524311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121212524311 = 139 ⋅872032549.

It can be written as a sum of positive squares in 2 ways, for example, as 43676402121 + 69748810000 = 208989^2 + 264100^2 .

It is a cyclic number.

It is not a de Polignac number, because 113425212121 - 2¹³ = 113425203929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113425212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4362508146 + ... + 4362508171.

It is an arithmetic number, because the mean of its divisors is an integer number (30537557113).

Almost surely, 2^113425212121 is an apocalyptic number.

It is an amenable number.

113425212121 is a deficient number, since it is larger than the sum of its proper divisors (8725016331).

113425212121 is an equidigital number, since it uses as much as digits as its factorization.

113425212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8725016330.

The product of its digits is 960, while the sum is 25.

Adding to 113425212121 its reverse (121212524311), we get a palindrome (234637736432).

The spelling of 113425212121 in words is "one hundred thirteen billion, four hundred twenty-five million, two hundred twelve thousand, one hundred twenty-one".