121201221121 has 2 divisors, whose sum is σ = 121201221122. Its totient is φ = 121201221120.

The previous prime is 121201221077. The next prime is 121201221133. The reversal of 121201221121 is 121122102121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102694611600 + 18506609521 = 320460^2 + 136039^2 .

It is an emirp because it is prime and its reverse (121122102121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121201221121 - 2¹³ = 121201212929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201221095 and 121201221104.

It is not a weakly prime, because it can be changed into another prime (121201221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600610560 + 60600610561.

It is an arithmetic number, because the mean of its divisors is an integer number (60600610561).

Almost surely, 2^121201221121 is an apocalyptic number.

It is an amenable number.

121201221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201221121 is an equidigital number, since it uses as much as digits as its factorization.

121201221121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121201221121 its reverse (121122102121), we get a palindrome (242323323242).

The spelling of 121201221121 in words is "one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-one".