120021211217 has 2 divisors, whose sum is σ = 120021211218. Its totient is φ = 120021211216.

The previous prime is 120021211201. The next prime is 120021211229. The reversal of 120021211217 is 712112120021.

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., 76070604481 + 43950606736 = 275809^2 + 209644^2 .

It is an emirp because it is prime and its reverse (712112120021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120021211217 - 2⁴ = 120021211201 is a prime.

It is a super-3 number, since 3×120021211217³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (120021211417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010605608 + 60010605609.

It is an arithmetic number, because the mean of its divisors is an integer number (60010605609).

Almost surely, 2^120021211217 is an apocalyptic number.

It is an amenable number.

120021211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021211217 is an equidigital number, since it uses as much as digits as its factorization.

120021211217 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 120021211217 its reverse (712112120021), we get a palindrome (832133331238).

The spelling of 120021211217 in words is "one hundred twenty billion, twenty-one million, two hundred eleven thousand, two hundred seventeen".