200121202120999 has 2 divisors, whose sum is σ = 200121202121000. Its totient is φ = 200121202120998.

The previous prime is 200121202120997. The next prime is 200121202121003. The reversal of 200121202120999 is 999021202121002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200121202120999 - 2¹ = 200121202120997 is a prime.

Together with 200121202120997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121202120997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060601060499 + 100060601060500.

It is an arithmetic number, because the mean of its divisors is an integer number (100060601060500).

Almost surely, 2^{200121202120999} is an apocalyptic number.

200121202120999 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121202120999 is an equidigital number, since it uses as much as digits as its factorization.

200121202120999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 200121202120999 in words is "two hundred trillion, one hundred twenty-one billion, two hundred two million, one hundred twenty thousand, nine hundred ninety-nine".