91002112210021 has 4 divisors (see below), whose sum is σ = 95791697063200. Its totient is φ = 86212527356844.

The previous prime is 91002112210013. The next prime is 91002112210043. The reversal of 91002112210021 is 12001221120019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91002112210021 - 2³ = 91002112210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91002112209974 and 91002112210001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91002112217021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2394792426561 + ... + 2394792426598.

It is an arithmetic number, because the mean of its divisors is an integer number (23947924265800).

Almost surely, 2^{91002112210021} is an apocalyptic number.

It is an amenable number.

91002112210021 is a deficient number, since it is larger than the sum of its proper divisors (4789584853179).

91002112210021 is a wasteful number, since it uses less digits than its factorization.

91002112210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789584853178.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 91002112210021 in words is "ninety-one trillion, two billion, one hundred twelve million, two hundred ten thousand, twenty-one".