200121199697813 has 2 divisors, whose sum is σ = 200121199697814. Its totient is φ = 200121199697812.

The previous prime is 200121199697779. The next prime is 200121199697849. The reversal of 200121199697813 is 318796991121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170612761381924 + 29508438315889 = 13061882^2 + 5432167^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121199697813 - 2³⁰ = 200120125955989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121199697893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060599848906 + 100060599848907.

It is an arithmetic number, because the mean of its divisors is an integer number (100060599848907).

Almost surely, 2^{200121199697813} is an apocalyptic number.

It is an amenable number.

200121199697813 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121199697813 is an equidigital number, since it uses as much as digits as its factorization.

200121199697813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The spelling of 200121199697813 in words is "two hundred trillion, one hundred twenty-one billion, one hundred ninety-nine million, six hundred ninety-seven thousand, eight hundred thirteen".