121021220100217 has 2 divisors, whose sum is σ = 121021220100218. Its totient is φ = 121021220100216.

The previous prime is 121021220100199. The next prime is 121021220100259. The reversal of 121021220100217 is 712001022120121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113324945685561 + 7696274414656 = 10645419^2 + 2774216^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021220100217 - 2⁷ = 121021220100089 is a prime.

It is a super-2 number, since 2×121021220100217² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121021220100317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510610050108 + 60510610050109.

It is an arithmetic number, because the mean of its divisors is an integer number (60510610050109).

Almost surely, 2^{121021220100217} is an apocalyptic number.

It is an amenable number.

121021220100217 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021220100217 is an equidigital number, since it uses as much as digits as its factorization.

121021220100217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 121021220100217 its reverse (712001022120121), we get a palindrome (833022242220338).

The spelling of 121021220100217 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty million, one hundred thousand, two hundred seventeen".