91102001021 has 8 divisors (see below), whose sum is σ = 96974337600. Its totient is φ = 85337413920.

The previous prime is 91102001017. The next prime is 91102001033. The reversal of 91102001021 is 12010020119.

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 91102001021 - 2² = 91102001017 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 (91102001821) 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, 26935625 + ... + 26939006.

It is an arithmetic number, because the mean of its divisors is an integer number (12121792200).

Almost surely, 2^91102001021 is an apocalyptic number.

It is an amenable number.

91102001021 is a deficient number, since it is larger than the sum of its proper divisors (5872336579).

91102001021 is a wasteful number, since it uses less digits than its factorization.

91102001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53874739.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 91102001021 in words is "ninety-one billion, one hundred two million, one thousand, twenty-one".