1423243421 has 2 divisors, whose sum is σ = 1423243422. Its totient is φ = 1423243420.

The previous prime is 1423243361. The next prime is 1423243429. The reversal of 1423243421 is 1243423241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367964196 + 55279225 = 36986^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423243421 - 2¹⁴ = 1423227037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423243429) 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 as a sum of consecutive naturals, namely, 711621710 + 711621711.

It is an arithmetic number, because the mean of its divisors is an integer number (711621711).

Almost surely, 2^1423243421 is an apocalyptic number.

It is an amenable number.

1423243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423243421 is an equidigital number, since it uses as much as digits as its factorization.

1423243421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 26.

The square root of 1423243421 is about 37725.8985446338. The cubic root of 1423243421 is about 1124.8459828001.

Adding to 1423243421 its reverse (1243423241), we get a palindrome (2666666662).

The spelling of 1423243421 in words is "one billion, four hundred twenty-three million, two hundred forty-three thousand, four hundred twenty-one".