43327721 has 2 divisors, whose sum is σ = 43327722. Its totient is φ = 43327720.

The previous prime is 43327681. The next prime is 43327723. The reversal of 43327721 is 12772334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 19669225 = 4864^2 + 4435^2 .

It is a cyclic number.

It is not a de Polignac number, because 43327721 - 2¹⁰ = 43326697 is a prime.

Together with 43327723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43327723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21663860 + 21663861.

It is an arithmetic number, because the mean of its divisors is an integer number (21663861).

Almost surely, 2^43327721 is an apocalyptic number.

It is an amenable number.

43327721 is a deficient number, since it is larger than the sum of its proper divisors (1).

43327721 is an equidigital number, since it uses as much as digits as its factorization.

43327721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 29.

The square root of 43327721 is about 6582.3795849222. The cubic root of 43327721 is about 351.2275832420.

The spelling of 43327721 in words is "forty-three million, three hundred twenty-seven thousand, seven hundred twenty-one".