121011220217 has 2 divisors, whose sum is σ = 121011220218. Its totient is φ = 121011220216.

The previous prime is 121011220201. The next prime is 121011220243. The reversal of 121011220217 is 712022110121.

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., 111388395001 + 9622825216 = 333749^2 + 98096^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011220217 - 2⁴ = 121011220201 is a prime.

It is not a weakly prime, because it can be changed into another prime (121011220817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505610108 + 60505610109.

It is an arithmetic number, because the mean of its divisors is an integer number (60505610109).

Almost surely, 2^121011220217 is an apocalyptic number.

It is an amenable number.

121011220217 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011220217 is an equidigital number, since it uses as much as digits as its factorization.

121011220217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 121011220217 its reverse (712022110121), we get a palindrome (833033330338).

The spelling of 121011220217 in words is "one hundred twenty-one billion, eleven million, two hundred twenty thousand, two hundred seventeen".