91968307221 has 24 divisors (see below), whose sum is σ = 142663541664. Its totient is φ = 52546384800.

The previous prime is 91968307213. The next prime is 91968307229. The reversal of 91968307221 is 12270386919.

It is an interprime number because it is at equal distance from previous prime (91968307213) and next prime (91968307229).

It is not a de Polignac number, because 91968307221 - 2³ = 91968307213 is a prime.

It is a super-3 number, since 3×91968307221³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91968307229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1204071 + ... + 1278171.

It is an arithmetic number, because the mean of its divisors is an integer number (5944314236).

Almost surely, 2^91968307221 is an apocalyptic number.

It is an amenable number.

91968307221 is a deficient number, since it is larger than the sum of its proper divisors (50695234443).

91968307221 is a wasteful number, since it uses less digits than its factorization.

91968307221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82561 (or 82554 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 91968307221 in words is "ninety-one billion, nine hundred sixty-eight million, three hundred seven thousand, two hundred twenty-one".