11721430249 has 4 divisors (see below), whose sum is σ = 12410926164. Its totient is φ = 11031934336.

The previous prime is 11721430247. The next prime is 11721430271. The reversal of 11721430249 is 94203412711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94203412711 = 4243 ⋅22202077.

It can be written as a sum of positive squares in 2 ways, for example, as 8701158400 + 3020271849 = 93280^2 + 54957^2 .

It is a cyclic number.

It is not a de Polignac number, because 11721430249 - 2¹ = 11721430247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11721430247) 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 3 ways as a sum of consecutive naturals, for example, 344747932 + ... + 344747965.

It is an arithmetic number, because the mean of its divisors is an integer number (3102731541).

Almost surely, 2^11721430249 is an apocalyptic number.

It is an amenable number.

11721430249 is a deficient number, since it is larger than the sum of its proper divisors (689495915).

11721430249 is an equidigital number, since it uses as much as digits as its factorization.

11721430249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689495914.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 11721430249 in words is "eleven billion, seven hundred twenty-one million, four hundred thirty thousand, two hundred forty-nine".