202121220127117 has 2 divisors, whose sum is σ = 202121220127118. Its totient is φ = 202121220127116.

The previous prime is 202121220127097. The next prime is 202121220127133. The reversal of 202121220127117 is 711721022121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196026152872356 + 6095067254761 = 14000934^2 + 2468819^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121220127117 - 2¹⁹ = 202121219602829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121220127187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060610063558 + 101060610063559.

It is an arithmetic number, because the mean of its divisors is an integer number (101060610063559).

Almost surely, 2^{202121220127117} is an apocalyptic number.

It is an amenable number.

202121220127117 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121220127117 is an equidigital number, since it uses as much as digits as its factorization.

202121220127117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 31.

Adding to 202121220127117 its reverse (711721022121202), we get a palindrome (913842242248319).

The spelling of 202121220127117 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-seven thousand, one hundred seventeen".