200021112121 has 4 divisors (see below), whose sum is σ = 204276880512. Its totient is φ = 195765343732.

The previous prime is 200021112101. The next prime is 200021112133. The reversal of 200021112121 is 121211120002.

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 200021112121 - 2⁵ = 200021112089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200021112101) 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, 2127884125 + ... + 2127884218.

It is an arithmetic number, because the mean of its divisors is an integer number (51069220128).

Almost surely, 2^200021112121 is an apocalyptic number.

It is an amenable number.

200021112121 is a deficient number, since it is larger than the sum of its proper divisors (4255768391).

200021112121 is an equidigital number, since it uses as much as digits as its factorization.

200021112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255768390.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 200021112121 its reverse (121211120002), we get a palindrome (321232232123).

The spelling of 200021112121 in words is "two hundred billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".