91221002112221 has 8 divisors (see below), whose sum is σ = 92801350684224. Its totient is φ = 89648863143840.

The previous prime is 91221002112209. The next prime is 91221002112269. The reversal of 91221002112221 is 12221120012219.

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 91221002112221 - 2⁶ = 91221002112157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91221002312221) 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, 2052378491 + ... + 2052422936.

It is an arithmetic number, because the mean of its divisors is an integer number (11600168835528).

Almost surely, 2^{91221002112221} is an apocalyptic number.

It is an amenable number.

91221002112221 is a deficient number, since it is larger than the sum of its proper divisors (1580348572003).

91221002112221 is a wasteful number, since it uses less digits than its factorization.

91221002112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104801811.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 91221002112221 in words is "ninety-one trillion, two hundred twenty-one billion, two million, one hundred twelve thousand, two hundred twenty-one".