11721443 has 2 divisors, whose sum is σ = 11721444. Its totient is φ = 11721442.

The previous prime is 11721431. The next prime is 11721473. The reversal of 11721443 is 34412711.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11721443 - 2⁸ = 11721187 is a prime.

It is not a weakly prime, because it can be changed into another prime (11721473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860721 + 5860722.

It is an arithmetic number, because the mean of its divisors is an integer number (5860722).

Almost surely, 2^11721443 is an apocalyptic number.

11721443 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721443 is an equidigital number, since it uses as much as digits as its factorization.

11721443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 11721443 is about 3423.6592996383. The cubic root of 11721443 is about 227.1574719030.

The spelling of 11721443 in words is "eleven million, seven hundred twenty-one thousand, four hundred forty-three".