1020121201217 has 2 divisors, whose sum is σ = 1020121201218. Its totient is φ = 1020121201216.

The previous prime is 1020121201201. The next prime is 1020121201277. The reversal of 1020121201217 is 7121021210201.

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., 1011169013761 + 8952187456 = 1005569^2 + 94616^2 .

It is an emirp because it is prime and its reverse (7121021210201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020121201217 - 2⁴ = 1020121201201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020121201277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060600608 + 510060600609.

It is an arithmetic number, because the mean of its divisors is an integer number (510060600609).

Almost surely, 2^{1020121201217} is an apocalyptic number.

It is an amenable number.

1020121201217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121201217 is an equidigital number, since it uses as much as digits as its factorization.

1020121201217 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 1020121201217 its reverse (7121021210201), we get a palindrome (8141142411418).

The spelling of 1020121201217 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred one thousand, two hundred seventeen".