120121210217 has 2 divisors, whose sum is σ = 120121210218. Its totient is φ = 120121210216.

The previous prime is 120121210177. The next prime is 120121210241. The reversal of 120121210217 is 712012121021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119563116841 + 558093376 = 345779^2 + 23624^2 .

It is a cyclic number.

It is not a de Polignac number, because 120121210217 - 2²² = 120117015913 is a prime.

It is not a weakly prime, because it can be changed into another prime (120121210247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060605108 + 60060605109.

It is an arithmetic number, because the mean of its divisors is an integer number (60060605109).

Almost surely, 2^120121210217 is an apocalyptic number.

It is an amenable number.

120121210217 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121210217 is an equidigital number, since it uses as much as digits as its factorization.

120121210217 is an evil number, because the sum of its binary digits is even.

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

Adding to 120121210217 its reverse (712012121021), we get a palindrome (832133331238).

The spelling of 120121210217 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, two hundred seventeen".