91320433221 has 8 divisors (see below), whose sum is σ = 121836636864. Its totient is φ = 60842259200.

The previous prime is 91320433201. The next prime is 91320433241. The reversal of 91320433221 is 12233402319.

It is an interprime number because it is at equal distance from previous prime (91320433201) and next prime (91320433241).

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

It is a cyclic number.

It is not a de Polignac number, because 91320433221 - 2¹⁵ = 91320400453 is a prime.

It is a super-2 number, since 2×91320433221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91320433201) 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, 9501801 + ... + 9511406.

It is an arithmetic number, because the mean of its divisors is an integer number (15229579608).

Almost surely, 2^91320433221 is an apocalyptic number.

It is an amenable number.

91320433221 is a deficient number, since it is larger than the sum of its proper divisors (30516203643).

91320433221 is a wasteful number, since it uses less digits than its factorization.

91320433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19014811.

The product of its (nonzero) digits is 7776, while the sum is 30.

The spelling of 91320433221 in words is "ninety-one billion, three hundred twenty million, four hundred thirty-three thousand, two hundred twenty-one".