91100010020 has 24 divisors (see below), whose sum is σ = 191690380224. Its totient is φ = 36367554656.

The previous prime is 91100010013. The next prime is 91100010047. The reversal of 91100010020 is 2001000119.

It is a junction number, because it is equal to n+sod(n) for n = 91100009977 and 91100010004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4517774 + ... + 4537893.

It is an arithmetic number, because the mean of its divisors is an integer number (7987099176).

Almost surely, 2^91100010020 is an apocalyptic number.

It is an amenable number.

91100010020 is an abundant number, since it is smaller than the sum of its proper divisors (100590370204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91100010020 is a wasteful number, since it uses less digits than its factorization.

91100010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9056179 (or 9056177 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 91100010020 its reverse (2001000119), we get a palindrome (93101010139).

The spelling of 91100010020 in words is "ninety-one billion, one hundred million, ten thousand, twenty".