91221334393 has 8 divisors (see below), whose sum is σ = 104793125888. Its totient is φ = 77784585984.

The previous prime is 91221334381. The next prime is 91221334447. The reversal of 91221334393 is 39343312219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91221334393 - 2²⁵ = 91187779961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91221334693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33759321 + ... + 33762022.

It is an arithmetic number, because the mean of its divisors is an integer number (13099140736).

Almost surely, 2^91221334393 is an apocalyptic number.

It is an amenable number.

91221334393 is a deficient number, since it is larger than the sum of its proper divisors (13571791495).

91221334393 is a wasteful number, since it uses less digits than its factorization.

91221334393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67521543.

The product of its digits is 104976, while the sum is 40.

The spelling of 91221334393 in words is "ninety-one billion, two hundred twenty-one million, three hundred thirty-four thousand, three hundred ninety-three".