91021201121 has 8 divisors (see below), whose sum is σ = 95076483264. Its totient is φ = 86974072240.

The previous prime is 91021201097. The next prime is 91021201123. The reversal of 91021201121 is 12110212019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91021201121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91021201093 and 91021201102.

It is not an unprimeable number, because it can be changed into a prime (91021201123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015486 + ... + 2060151.

It is an arithmetic number, because the mean of its divisors is an integer number (11884560408).

Almost surely, 2^91021201121 is an apocalyptic number.

It is an amenable number.

91021201121 is a deficient number, since it is larger than the sum of its proper divisors (4055282143).

91021201121 is a wasteful number, since it uses less digits than its factorization.

91021201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076631.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 91021201121 in words is "ninety-one billion, twenty-one million, two hundred one thousand, one hundred twenty-one".