11999721119 has 4 divisors (see below), whose sum is σ = 12324037944. Its totient is φ = 11675404296.

The previous prime is 11999721101. The next prime is 11999721121. The reversal of 11999721119 is 91112799911.

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-11999721119 is a prime.

It is a super-2 number, since 2×11999721119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999724119) 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, 162158357 + ... + 162158430.

It is an arithmetic number, because the mean of its divisors is an integer number (3081009486).

Almost surely, 2^11999721119 is an apocalyptic number.

11999721119 is a deficient number, since it is larger than the sum of its proper divisors (324316825).

11999721119 is an equidigital number, since it uses as much as digits as its factorization.

11999721119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324316824.

The product of its digits is 91854, while the sum is 50.

The spelling of 11999721119 in words is "eleven billion, nine hundred ninety-nine million, seven hundred twenty-one thousand, one hundred nineteen".