201221002120939 has 2 divisors, whose sum is σ = 201221002120940. Its totient is φ = 201221002120938.

The previous prime is 201221002120909. The next prime is 201221002121011. The reversal of 201221002120939 is 939021200122102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201221002120939 - 2⁵ = 201221002120907 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221002120909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610501060469 + 100610501060470.

It is an arithmetic number, because the mean of its divisors is an integer number (100610501060470).

Almost surely, 2^{201221002120939} is an apocalyptic number.

201221002120939 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221002120939 is an equidigital number, since it uses as much as digits as its factorization.

201221002120939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 201221002120939 in words is "two hundred one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, nine hundred thirty-nine".