122121200121 has 4 divisors (see below), whose sum is σ = 162828266832. Its totient is φ = 81414133412.

The previous prime is 122121200063. The next prime is 122121200141. The reversal of 122121200121 is 121002121221.

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: 121002121221 = 3 ⋅40334040407.

It is a cyclic number.

It is not a de Polignac number, because 122121200121 - 2¹⁰ = 122121199097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122121200121.

It is not an unprimeable number, because it can be changed into a prime (122121200141) 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, 20353533351 + ... + 20353533356.

It is an arithmetic number, because the mean of its divisors is an integer number (40707066708).

Almost surely, 2^122121200121 is an apocalyptic number.

It is an amenable number.

122121200121 is a deficient number, since it is larger than the sum of its proper divisors (40707066711).

122121200121 is an equidigital number, since it uses as much as digits as its factorization.

122121200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40707066710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 122121200121 its reverse (121002121221), we get a palindrome (243123321342).

The spelling of 122121200121 in words is "one hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".