2191418240923 has 4 divisors (see below), whose sum is σ = 2197389408160. Its totient is φ = 2185447073688.

The previous prime is 2191418240917. The next prime is 2191418240927. The reversal of 2191418240923 is 3290428141912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191418240923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191418240927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2985583068 + ... + 2985583801.

It is an arithmetic number, because the mean of its divisors is an integer number (549347352040).

Almost surely, 2^{2191418240923} is an apocalyptic number.

2191418240923 is a deficient number, since it is larger than the sum of its proper divisors (5971167237).

2191418240923 is an equidigital number, since it uses as much as digits as its factorization.

2191418240923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5971167236.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 2191418240923 in words is "two trillion, one hundred ninety-one billion, four hundred eighteen million, two hundred forty thousand, nine hundred twenty-three".