221200110091 has 4 divisors (see below), whose sum is σ = 221203120432. Its totient is φ = 221197099752.

The previous prime is 221200110073. The next prime is 221200110149. The reversal of 221200110091 is 190011002122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190011002122 = 2 ⋅95005501061.

It is a cyclic number.

It is not a de Polignac number, because 221200110091 - 2¹¹ = 221200108043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200110031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392120 + ... + 1542853.

It is an arithmetic number, because the mean of its divisors is an integer number (55300780108).

Almost surely, 2^221200110091 is an apocalyptic number.

221200110091 is a deficient number, since it is larger than the sum of its proper divisors (3010341).

221200110091 is an equidigital number, since it uses as much as digits as its factorization.

221200110091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010340.

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

The spelling of 221200110091 in words is "two hundred twenty-one billion, two hundred million, one hundred ten thousand, ninety-one".