11921517199 has 8 divisors (see below), whose sum is σ = 12074434560. Its totient is φ = 11768650296.

The previous prime is 11921517163. The next prime is 11921517217. The reversal of 11921517199 is 99171512911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11921517199 - 2⁹ = 11921516687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921517109) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 773442 + ... + 788704.

It is an arithmetic number, because the mean of its divisors is an integer number (1509304320).

Almost surely, 2^11921517199 is an apocalyptic number.

11921517199 is a deficient number, since it is larger than the sum of its proper divisors (152917361).

11921517199 is an equidigital number, since it uses as much as digits as its factorization.

11921517199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25229.

The product of its digits is 51030, while the sum is 46.

The spelling of 11921517199 in words is "eleven billion, nine hundred twenty-one million, five hundred seventeen thousand, one hundred ninety-nine".