1042443221 has 4 divisors (see below), whose sum is σ = 1064622912. Its totient is φ = 1020263532.

The previous prime is 1042443203. The next prime is 1042443239. The reversal of 1042443221 is 1223442401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223442401 = 29 ⋅42187669.

It is an interprime number because it is at equal distance from previous prime (1042443203) and next prime (1042443239).

It is a cyclic number.

It is not a de Polignac number, because 1042443221 - 2²² = 1038248917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042442221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11089775 + ... + 11089868.

It is an arithmetic number, because the mean of its divisors is an integer number (266155728).

Almost surely, 2^1042443221 is an apocalyptic number.

It is an amenable number.

1042443221 is a deficient number, since it is larger than the sum of its proper divisors (22179691).

1042443221 is an equidigital number, since it uses as much as digits as its factorization.

1042443221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22179690.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1042443221 is about 32286.8893051034. The cubic root of 1042443221 is about 1013.9521719080.

Adding to 1042443221 its reverse (1223442401), we get a palindrome (2265885622).

The spelling of 1042443221 in words is "one billion, forty-two million, four hundred forty-three thousand, two hundred twenty-one".