42443221 has 4 divisors (see below), whose sum is σ = 42514444. Its totient is φ = 42372000.

The previous prime is 42443197. The next prime is 42443239. The reversal of 42443221 is 12234424.

It is a happy number.

42443221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 6275025 = 6014^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 42443221 - 2⁵ = 42443189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42443192 and 42443201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42443281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34710 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (10628611).

Almost surely, 2^42443221 is an apocalyptic number.

It is an amenable number.

42443221 is a deficient number, since it is larger than the sum of its proper divisors (71223).

42443221 is an equidigital number, since it uses as much as digits as its factorization.

42443221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71222.

The product of its digits is 1536, while the sum is 22.

The square root of 42443221 is about 6514.8461992590. The cubic root of 42443221 is about 348.8211249103.

Adding to 42443221 its reverse (12234424), we get a palindrome (54677645).

The spelling of 42443221 in words is "forty-two million, four hundred forty-three thousand, two hundred twenty-one".