200021220121117 has 2 divisors, whose sum is σ = 200021220121118. Its totient is φ = 200021220121116.

The previous prime is 200021220121109. The next prime is 200021220121123. The reversal of 200021220121117 is 711121022120002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195397735368676 + 4623484752441 = 13978474^2 + 2150229^2 .

It is a cyclic number.

It is not a de Polignac number, because 200021220121117 - 2³ = 200021220121109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200021220122117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010610060558 + 100010610060559.

It is an arithmetic number, because the mean of its divisors is an integer number (100010610060559).

Almost surely, 2^{200021220121117} is an apocalyptic number.

It is an amenable number.

200021220121117 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021220121117 is an equidigital number, since it uses as much as digits as its factorization.

200021220121117 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 200021220121117 its reverse (711121022120002), we get a palindrome (911142242241119).

The spelling of 200021220121117 in words is "two hundred trillion, twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred seventeen".