1201202220121 has 2 divisors, whose sum is σ = 1201202220122. Its totient is φ = 1201202220120.

The previous prime is 1201202219993. The next prime is 1201202220137. The reversal of 1201202220121 is 1210222021021.

It is a happy number.

It is an a-pointer prime, because the next prime (1201202220137) can be obtained adding 1201202220121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992535980121 + 208666240000 = 996261^2 + 456800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201202220121 - 2⁷ = 1201202219993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201202220095 and 1201202220104.

It is not a weakly prime, because it can be changed into another prime (1201202220181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600601110060 + 600601110061.

It is an arithmetic number, because the mean of its divisors is an integer number (600601110061).

Almost surely, 2^{1201202220121} is an apocalyptic number.

It is an amenable number.

1201202220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201202220121 is an equidigital number, since it uses as much as digits as its factorization.

1201202220121 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 1201202220121 its reverse (1210222021021), we get a palindrome (2411424241142).

The spelling of 1201202220121 in words is "one trillion, two hundred one billion, two hundred two million, two hundred twenty thousand, one hundred twenty-one".