200021120121 has 4 divisors (see below), whose sum is σ = 266694826832. Its totient is φ = 133347413412.

The previous prime is 200021120099. The next prime is 200021120183. The reversal of 200021120121 is 121021120002.

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 not a de Polignac number, because 200021120121 - 2⁷ = 200021119993 is a prime.

It is a super-2 number, since 2×200021120121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021120097 and 200021120106.

It is not an unprimeable number, because it can be changed into a prime (200021120021) 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, 33336853351 + ... + 33336853356.

It is an arithmetic number, because the mean of its divisors is an integer number (66673706708).

Almost surely, 2^200021120121 is an apocalyptic number.

It is an amenable number.

200021120121 is a deficient number, since it is larger than the sum of its proper divisors (66673706711).

200021120121 is an equidigital number, since it uses as much as digits as its factorization.

200021120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66673706710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 200021120121 its reverse (121021120002), we get a palindrome (321042240123).

The spelling of 200021120121 in words is "two hundred billion, twenty-one million, one hundred twenty thousand, one hundred twenty-one".