202113112121 has 4 divisors (see below), whose sum is σ = 204959775744. Its totient is φ = 199266448500.

The previous prime is 202113112093. The next prime is 202113112129. The reversal of 202113112121 is 121211311202.

It is a happy number.

202113112121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202113112121 - 2⁶ = 202113112057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 202113112121.

It is not an unprimeable number, because it can be changed into a prime (202113112129) 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, 1423331705 + ... + 1423331846.

It is an arithmetic number, because the mean of its divisors is an integer number (51239943936).

Almost surely, 2^202113112121 is an apocalyptic number.

It is an amenable number.

202113112121 is a deficient number, since it is larger than the sum of its proper divisors (2846663623).

202113112121 is an equidigital number, since it uses as much as digits as its factorization.

202113112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846663622.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 202113112121 its reverse (121211311202), we get a palindrome (323324423323).

The spelling of 202113112121 in words is "two hundred two billion, one hundred thirteen million, one hundred twelve thousand, one hundred twenty-one".