191100102020 has 48 divisors (see below), whose sum is σ = 421277068800. Its totient is φ = 72720418560.

The previous prime is 191100101993. The next prime is 191100102029. The reversal of 191100102020 is 20201001191.

It is a self number, because there is not a number n which added to its sum of digits gives 191100102020.

It is not an unprimeable number, because it can be changed into a prime (191100102029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2575505 + ... + 2648664.

It is an arithmetic number, because the mean of its divisors is an integer number (8776605600).

Almost surely, 2^191100102020 is an apocalyptic number.

191100102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191100102020 is an abundant number, since it is smaller than the sum of its proper divisors (230176966780).

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

191100102020 is a wasteful number, since it uses less digits than its factorization.

191100102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5224268 (or 5224266 counting only the distinct ones).

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

The spelling of 191100102020 in words is "one hundred ninety-one billion, one hundred million, one hundred two thousand, twenty".