202201212121217 has 2 divisors, whose sum is σ = 202201212121218. Its totient is φ = 202201212121216.

The previous prime is 202201212121187. The next prime is 202201212121267. The reversal of 202201212121217 is 712121212102202.

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., 164988784281616 + 37212427839601 = 12844796^2 + 6100199^2 .

It is a cyclic number.

It is not a de Polignac number, because 202201212121217 - 2¹⁶ = 202201212055681 is a prime.

It is a super-2 number, since 2×202201212121217² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (202201212121267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101100606060608 + 101100606060609.

It is an arithmetic number, because the mean of its divisors is an integer number (101100606060609).

Almost surely, 2^{202201212121217} is an apocalyptic number.

It is an amenable number.

202201212121217 is a deficient number, since it is larger than the sum of its proper divisors (1).

202201212121217 is an equidigital number, since it uses as much as digits as its factorization.

202201212121217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 202201212121217 its reverse (712121212102202), we get a palindrome (914322424223419).

The spelling of 202201212121217 in words is "two hundred two trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred seventeen".