221011119991 has 2 divisors, whose sum is σ = 221011119992. Its totient is φ = 221011119990.

The previous prime is 221011119911. The next prime is 221011120007. The reversal of 221011119991 is 199911110122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221011119991 - 2⁷ = 221011119863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221011119991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011119911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505559995 + 110505559996.

It is an arithmetic number, because the mean of its divisors is an integer number (110505559996).

Almost surely, 2^221011119991 is an apocalyptic number.

221011119991 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011119991 is an equidigital number, since it uses as much as digits as its factorization.

221011119991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 37.

The spelling of 221011119991 in words is "two hundred twenty-one billion, eleven million, one hundred nineteen thousand, nine hundred ninety-one".