191889201220 has 48 divisors (see below), whose sum is σ = 413019029808. Its totient is φ = 74843095040.

The previous prime is 191889201191. The next prime is 191889201233. The reversal of 191889201220 is 22102988191.

191889201220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1246937344 + 190642263876 = 35312^2 + 436626^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1476804 + ... + 1601476.

It is an arithmetic number, because the mean of its divisors is an integer number (8604563121).

Almost surely, 2^191889201220 is an apocalyptic number.

191889201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191889201220 is an abundant number, since it is smaller than the sum of its proper divisors (221129828588).

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

191889201220 is a wasteful number, since it uses less digits than its factorization.

191889201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126600 (or 126598 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The spelling of 191889201220 in words is "one hundred ninety-one billion, eight hundred eighty-nine million, two hundred one thousand, two hundred twenty".