202221109991 has 2 divisors, whose sum is σ = 202221109992. Its totient is φ = 202221109990.

The previous prime is 202221109963. The next prime is 202221110029. The reversal of 202221109991 is 199901122202.

It is a happy number.

202221109991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (202221110029) can be obtained adding 202221109991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202221109991 - 2⁶ = 202221109927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221109591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110554995 + 101110554996.

It is an arithmetic number, because the mean of its divisors is an integer number (101110554996).

Almost surely, 2^202221109991 is an apocalyptic number.

202221109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221109991 is an equidigital number, since it uses as much as digits as its factorization.

202221109991 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 202221109991 in words is "two hundred two billion, two hundred twenty-one million, one hundred nine thousand, nine hundred ninety-one".