200121122011997 has 2 divisors, whose sum is σ = 200121122011998. Its totient is φ = 200121122011996.

The previous prime is 200121122011969. The next prime is 200121122012041. The reversal of 200121122011997 is 799110221121002.

200121122011997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191034580968676 + 9086541043321 = 13821526^2 + 3014389^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121122011997 - 2¹⁰ = 200121122010973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200121122011997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121122011297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060561005998 + 100060561005999.

It is an arithmetic number, because the mean of its divisors is an integer number (100060561005999).

Almost surely, 2^{200121122011997} is an apocalyptic number.

It is an amenable number.

200121122011997 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121122011997 is an equidigital number, since it uses as much as digits as its factorization.

200121122011997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

Adding to 200121122011997 its reverse (799110221121002), we get a palindrome (999231343132999).

The spelling of 200121122011997 in words is "two hundred trillion, one hundred twenty-one billion, one hundred twenty-two million, eleven thousand, nine hundred ninety-seven".