200121221101 has 4 divisors (see below), whose sum is σ = 200128571100. Its totient is φ = 200113871104.

The previous prime is 200121221071. The next prime is 200121221107. The reversal of 200121221101 is 101122121002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128418306025 + 71702915076 = 358355^2 + 267774^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121221101 - 2¹⁹ = 200120696813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121221107) 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, 3634006 + ... + 3688663.

It is an arithmetic number, because the mean of its divisors is an integer number (50032142775).

Almost surely, 2^200121221101 is an apocalyptic number.

It is an amenable number.

200121221101 is a deficient number, since it is larger than the sum of its proper divisors (7349999).

200121221101 is an equidigital number, since it uses as much as digits as its factorization.

200121221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7349998.

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

Adding to 200121221101 its reverse (101122121002), we get a palindrome (301243342103).

The spelling of 200121221101 in words is "two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred one".