1042243421 has 4 divisors (see below), whose sum is σ = 1044923100. Its totient is φ = 1039563744.

The previous prime is 1042243403. The next prime is 1042243439. The reversal of 1042243421 is 1243422401.

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

It is an interprime number because it is at equal distance from previous prime (1042243403) and next prime (1042243439).

It can be written as a sum of positive squares in 2 ways, for example, as 141943396 + 900300025 = 11914^2 + 30005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042243421 - 2¹⁸ = 1041981277 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 (1042248421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339256 + ... + 1340033.

It is an arithmetic number, because the mean of its divisors is an integer number (261230775).

Almost surely, 2^1042243421 is an apocalyptic number.

It is an amenable number.

1042243421 is a deficient number, since it is larger than the sum of its proper divisors (2679679).

1042243421 is an equidigital number, since it uses as much as digits as its factorization.

1042243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679678.

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

The square root of 1042243421 is about 32283.7950216513. The cubic root of 1042243421 is about 1013.8873880157.

Adding to 1042243421 its reverse (1243422401), we get a palindrome (2285665822).

The spelling of 1042243421 in words is "one billion, forty-two million, two hundred forty-three thousand, four hundred twenty-one".