91221122112 has 112 divisors (see below), whose sum is σ = 254884976640. Its totient is φ = 28734458368.

The previous prime is 91221122101. The next prime is 91221122117. The reversal of 91221122112 is 21122112219.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (91221122117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242089 + ... + 490967.

It is an arithmetic number, because the mean of its divisors is an integer number (2275758720).

Almost surely, 2^91221122112 is an apocalyptic number.

91221122112 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91221122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127442488320).

91221122112 is an abundant number, since it is smaller than the sum of its proper divisors (163663854528).

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

91221122112 is a wasteful number, since it uses less digits than its factorization.

91221122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249000 (or 248990 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The spelling of 91221122112 in words is "ninety-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twelve".