11721436443 has 24 divisors (see below), whose sum is σ = 17541728256. Its totient is φ = 7534263600.

The previous prime is 11721436429. The next prime is 11721436451. The reversal of 11721436443 is 34463412711.

11721436443 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 1 + 4 + 3 + 644 + 3 = 666.

It is not a de Polignac number, because 11721436443 - 2¹⁶ = 11721370907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11721436398 and 11721436407.

It is not an unprimeable number, because it can be changed into a prime (11721436343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1905 + ... + 153122.

It is an arithmetic number, because the mean of its divisors is an integer number (730905344).

Almost surely, 2^11721436443 is an apocalyptic number.

11721436443 is a deficient number, since it is larger than the sum of its proper divisors (5820291813).

11721436443 is a wasteful number, since it uses less digits than its factorization.

11721436443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155335 (or 155332 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The spelling of 11721436443 in words is "eleven billion, seven hundred twenty-one million, four hundred thirty-six thousand, four hundred forty-three".