2191899198243 has 32 divisors (see below), whose sum is σ = 3210956812800. Its totient is φ = 1323816189696.

The previous prime is 2191899198211. The next prime is 2191899198253. The reversal of 2191899198243 is 3428919981912.

It is not a de Polignac number, because 2191899198243 - 2⁵ = 2191899198211 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2191899198253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4757703 + ... + 5198031.

It is an arithmetic number, because the mean of its divisors is an integer number (100342400400).

Almost surely, 2^{2191899198243} is an apocalyptic number.

2191899198243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2191899198243 is a deficient number, since it is larger than the sum of its proper divisors (1019057614557).

2191899198243 is a wasteful number, since it uses less digits than its factorization.

2191899198243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444171.

The product of its digits is 20155392, while the sum is 66.

The spelling of 2191899198243 in words is "two trillion, one hundred ninety-one billion, eight hundred ninety-nine million, one hundred ninety-eight thousand, two hundred forty-three".