11821903679 has 4 divisors (see below), whose sum is σ = 12229555560. Its totient is φ = 11414251800.

The previous prime is 11821903673. The next prime is 11821903733. The reversal of 11821903679 is 97630912811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97630912811 = 210911 ⋅462901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11821903679 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 (11821903673) 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, 203825897 + ... + 203825954.

It is an arithmetic number, because the mean of its divisors is an integer number (3057388890).

Almost surely, 2^11821903679 is an apocalyptic number.

11821903679 is a deficient number, since it is larger than the sum of its proper divisors (407651881).

11821903679 is an equidigital number, since it uses as much as digits as its factorization.

11821903679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407651880.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 11821903679 in words is "eleven billion, eight hundred twenty-one million, nine hundred three thousand, six hundred seventy-nine".