121220203211 has 2 divisors, whose sum is σ = 121220203212. Its totient is φ = 121220203210.

The previous prime is 121220203201. The next prime is 121220203219. The reversal of 121220203211 is 112302022121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121220203211 - 2³⁰ = 120146461387 is a prime.

It is a super-2 number, since 2×121220203211² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121220203211.

It is not a weakly prime, because it can be changed into another prime (121220203219) 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, 60610101605 + 60610101606.

It is an arithmetic number, because the mean of its divisors is an integer number (60610101606).

Almost surely, 2^121220203211 is an apocalyptic number.

121220203211 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220203211 is an equidigital number, since it uses as much as digits as its factorization.

121220203211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121220203211 its reverse (112302022121), we get a palindrome (233522225332).

The spelling of 121220203211 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred three thousand, two hundred eleven".