202221000109991 has 2 divisors, whose sum is σ = 202221000109992. Its totient is φ = 202221000109990.

The previous prime is 202221000109981. The next prime is 202221000110027. The reversal of 202221000109991 is 199901000122202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202221000109991 - 2⁶ = 202221000109927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221000109981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110500054995 + 101110500054996.

It is an arithmetic number, because the mean of its divisors is an integer number (101110500054996).

Almost surely, 2^{202221000109991} is an apocalyptic number.

202221000109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221000109991 is an equidigital number, since it uses as much as digits as its factorization.

202221000109991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 202221000109991 in words is "two hundred two trillion, two hundred twenty-one billion, one hundred nine thousand, nine hundred ninety-one".