121200122221 has 2 divisors, whose sum is σ = 121200122222. Its totient is φ = 121200122220.

The previous prime is 121200122207. The next prime is 121200122249. The reversal of 121200122221 is 122221002121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68754084100 + 52446038121 = 262210^2 + 229011^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200122221 - 2²⁹ = 120663251309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200122195 and 121200122204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200122291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600061110 + 60600061111.

It is an arithmetic number, because the mean of its divisors is an integer number (60600061111).

Almost surely, 2^121200122221 is an apocalyptic number.

It is an amenable number.

121200122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200122221 is an equidigital number, since it uses as much as digits as its factorization.

121200122221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121200122221 its reverse (122221002121), we get a palindrome (243421124342).

The spelling of 121200122221 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-two thousand, two hundred twenty-one".