91910010221 has 8 divisors (see below), whose sum is σ = 96851539200. Its totient is φ = 86978897280.

The previous prime is 91910010193. The next prime is 91910010239. The reversal of 91910010221 is 12201001919.

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 91910010221 - 2³⁴ = 74730141037 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 (91910010121) 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, 2585885 + ... + 2621186.

It is an arithmetic number, because the mean of its divisors is an integer number (12106442400).

Almost surely, 2^91910010221 is an apocalyptic number.

It is an amenable number.

91910010221 is a deficient number, since it is larger than the sum of its proper divisors (4941528979).

91910010221 is a wasteful number, since it uses less digits than its factorization.

91910010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208019.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 91910010221 in words is "ninety-one billion, nine hundred ten million, ten thousand, two hundred twenty-one".