1043242421 has 4 divisors (see below), whose sum is σ = 1123491852. Its totient is φ = 962992992.

The previous prime is 1043242381. The next prime is 1043242439. The reversal of 1043242421 is 1242423401.

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 484440100 + 558802321 = 22010^2 + 23639^2 .

It is not a de Polignac number, because 1043242421 - 2⁶ = 1043242357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043242021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40124696 + ... + 40124721.

It is an arithmetic number, because the mean of its divisors is an integer number (280872963).

Almost surely, 2^1043242421 is an apocalyptic number.

It is an amenable number.

1043242421 is a deficient number, since it is larger than the sum of its proper divisors (80249431).

1043242421 is an equidigital number, since it uses as much as digits as its factorization.

1043242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80249430.

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

The square root of 1043242421 is about 32299.2634745748. The cubic root of 1043242421 is about 1014.2112247305.

Adding to 1043242421 its reverse (1242423401), we get a palindrome (2285665822).

The spelling of 1043242421 in words is "one billion, forty-three million, two hundred forty-two thousand, four hundred twenty-one".