200122222121 has 4 divisors (see below), whose sum is σ = 200805233412. Its totient is φ = 199439210832.

The previous prime is 200122222109. The next prime is 200122222141. The reversal of 200122222121 is 121222221002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121222221002 = 2 ⋅60611110501.

It can be written as a sum of positive squares in 2 ways, for example, as 103578410896 + 96543811225 = 321836^2 + 310715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200122222121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200122222121.

It is not an unprimeable number, because it can be changed into a prime (200122222141) 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, 341505206 + ... + 341505791.

It is an arithmetic number, because the mean of its divisors is an integer number (50201308353).

Almost surely, 2^200122222121 is an apocalyptic number.

It is an amenable number.

200122222121 is a deficient number, since it is larger than the sum of its proper divisors (683011291).

200122222121 is an equidigital number, since it uses as much as digits as its factorization.

200122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683011290.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 200122222121 its reverse (121222221002), we get a palindrome (321344443123).

The spelling of 200122222121 in words is "two hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".