221102100091 has 2 divisors, whose sum is σ = 221102100092. Its totient is φ = 221102100090.

The previous prime is 221102100059. The next prime is 221102100127. The reversal of 221102100091 is 190001201122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221102100091 - 2⁵ = 221102100059 is a prime.

It is a super-2 number, since 2×221102100091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221102100031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551050045 + 110551050046.

It is an arithmetic number, because the mean of its divisors is an integer number (110551050046).

Almost surely, 2^221102100091 is an apocalyptic number.

221102100091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102100091 is an equidigital number, since it uses as much as digits as its factorization.

221102100091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 221102100091 in words is "two hundred twenty-one billion, one hundred two million, one hundred thousand, ninety-one".