91120211221001 has 16 divisors (see below), whose sum is σ = 96067426118400. Its totient is φ = 86188153777488.

The previous prime is 91120211220967. The next prime is 91120211221003. The reversal of 91120211221001 is 10012211202119.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91120211221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91120211221003) 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, 212981366 + ... + 213408768.

It is an arithmetic number, because the mean of its divisors is an integer number (6004214132400).

Almost surely, 2^{91120211221001} is an apocalyptic number.

It is an amenable number.

91120211221001 is a deficient number, since it is larger than the sum of its proper divisors (4947214897399).

91120211221001 is a wasteful number, since it uses less digits than its factorization.

91120211221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445108.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 91120211221001 in words is "ninety-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, one".