200121216906997 has 2 divisors, whose sum is σ = 200121216906998. Its totient is φ = 200121216906996.

The previous prime is 200121216906973. The next prime is 200121216907009. The reversal of 200121216906997 is 799609612121002.

It is a happy number.

200121216906997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115398599155876 + 84722617751121 = 10742374^2 + 9204489^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121216906997 - 2⁷ = 200121216906869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121216903997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060608453498 + 100060608453499.

It is an arithmetic number, because the mean of its divisors is an integer number (100060608453499).

Almost surely, 2^{200121216906997} is an apocalyptic number.

It is an amenable number.

200121216906997 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121216906997 is an equidigital number, since it uses as much as digits as its factorization.

200121216906997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 200121216906997 in words is "two hundred trillion, one hundred twenty-one billion, two hundred sixteen million, nine hundred six thousand, nine hundred ninety-seven".