200121111202121 has 16 divisors (see below), whose sum is σ = 212713657578000. Its totient is φ = 187619972886528.

The previous prime is 200121111202099. The next prime is 200121111202163. The reversal of 200121111202121 is 121202111121002.

It can be written as a sum of positive squares in 8 ways, for example, as 1186870798096 + 198934240404025 = 1089436^2 + 14104405^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121111202121 - 2²² = 200121107007817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 200121111202121.

It is not an unprimeable number, because it can be changed into a prime (200121111202921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26098391 + ... + 32884163.

It is an arithmetic number, because the mean of its divisors is an integer number (13294603598625).

Almost surely, 2^{200121111202121} is an apocalyptic number.

It is an amenable number.

200121111202121 is a deficient number, since it is larger than the sum of its proper divisors (12592546375879).

200121111202121 is a wasteful number, since it uses less digits than its factorization.

200121111202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792508.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 200121111202121 its reverse (121202111121002), we get a palindrome (321323222323123).

The spelling of 200121111202121 in words is "two hundred trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".