200121112001 has 4 divisors (see below), whose sum is σ = 200156606400. Its totient is φ = 200085617604.

The previous prime is 200121111991. The next prime is 200121112003. The reversal of 200121112001 is 100211121002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100211121002 = 2 ⋅50105560501.

It is a cyclic number.

It is not a de Polignac number, because 200121112001 - 2²⁶ = 200054003137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (200121112003) 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, 17738741 + ... + 17750018.

It is an arithmetic number, because the mean of its divisors is an integer number (50039151600).

Almost surely, 2^200121112001 is an apocalyptic number.

It is an amenable number.

200121112001 is a deficient number, since it is larger than the sum of its proper divisors (35494399).

200121112001 is an equidigital number, since it uses as much as digits as its factorization.

200121112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35494398.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 200121112001 its reverse (100211121002), we get a palindrome (300332233003).

Subtracting from 200121112001 its reverse (100211121002), we obtain a palindrome (99909990999).

The spelling of 200121112001 in words is "two hundred billion, one hundred twenty-one million, one hundred twelve thousand, one".