91221379206 has 48 divisors (see below), whose sum is σ = 193548206592. Its totient is φ = 28608111840.

The previous prime is 91221379187. The next prime is 91221379297. The reversal of 91221379206 is 60297312219.

It is a super-3 number, since 3×91221379206³ (a number of 34 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424675 + ... + 602321.

It is an arithmetic number, because the mean of its divisors is an integer number (4032254304).

Almost surely, 2^91221379206 is an apocalyptic number.

91221379206 is an abundant number, since it is smaller than the sum of its proper divisors (102326827386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91221379206 is a wasteful number, since it uses less digits than its factorization.

91221379206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177797 (or 177736 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 91221379206 in words is "ninety-one billion, two hundred twenty-one million, three hundred seventy-nine thousand, two hundred six".