12420340191 has 24 divisors (see below), whose sum is σ = 20546273280. Its totient is φ = 7082503056.

The previous prime is 12420340189. The next prime is 12420340201. The reversal of 12420340191 is 19104302421.

It is a happy number.

12420340191 is a `hidden beast` number, since 12 + 420 + 3 + 40 + 191 = 666.

It is not a de Polignac number, because 12420340191 - 2¹ = 12420340189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420340151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175615 + ... + 235968.

It is an arithmetic number, because the mean of its divisors is an integer number (856094720).

Almost surely, 2^12420340191 is an apocalyptic number.

12420340191 is a deficient number, since it is larger than the sum of its proper divisors (8125933089).

12420340191 is a wasteful number, since it uses less digits than its factorization.

12420340191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412075 (or 412072 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 12420340191 in words is "twelve billion, four hundred twenty million, three hundred forty thousand, one hundred ninety-one".