11800491321 has 4 divisors (see below), whose sum is σ = 15733988432. Its totient is φ = 7866994212.

The previous prime is 11800491317. The next prime is 11800491323. The reversal of 11800491321 is 12319400811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12319400811 = 3 ⋅4106466937.

It is not a de Polignac number, because 11800491321 - 2² = 11800491317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11800491323) 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, 1966748551 + ... + 1966748556.

It is an arithmetic number, because the mean of its divisors is an integer number (3933497108).

Almost surely, 2^11800491321 is an apocalyptic number.

It is an amenable number.

11800491321 is a deficient number, since it is larger than the sum of its proper divisors (3933497111).

11800491321 is an equidigital number, since it uses as much as digits as its factorization.

11800491321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933497110.

The product of its (nonzero) digits is 1728, while the sum is 30.

The spelling of 11800491321 in words is "eleven billion, eight hundred million, four hundred ninety-one thousand, three hundred twenty-one".