91100233221 has 4 divisors (see below), whose sum is σ = 121466977632. Its totient is φ = 60733488812.

The previous prime is 91100233171. The next prime is 91100233241. The reversal of 91100233221 is 12233200119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91100233221 - 2¹⁵ = 91100200453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91100233191 and 91100233200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91100233241) 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, 15183372201 + ... + 15183372206.

It is an arithmetic number, because the mean of its divisors is an integer number (30366744408).

Almost surely, 2^91100233221 is an apocalyptic number.

It is an amenable number.

91100233221 is a deficient number, since it is larger than the sum of its proper divisors (30366744411).

91100233221 is a wasteful number, since it uses less digits than its factorization.

91100233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30366744410.

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 91100233221 in words is "ninety-one billion, one hundred million, two hundred thirty-three thousand, two hundred twenty-one".