421234243 has 2 divisors, whose sum is σ = 421234244. Its totient is φ = 421234242.

The previous prime is 421234207. The next prime is 421234249. The reversal of 421234243 is 342432124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421234243 is a prime.

It is not a weakly prime, because it can be changed into another prime (421234249) 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 as a sum of consecutive naturals, namely, 210617121 + 210617122.

It is an arithmetic number, because the mean of its divisors is an integer number (210617122).

Almost surely, 2^421234243 is an apocalyptic number.

421234243 is a deficient number, since it is larger than the sum of its proper divisors (1).

421234243 is an equidigital number, since it uses as much as digits as its factorization.

421234243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 421234243 is about 20523.9918875447. The cubic root of 421234243 is about 749.6200997484.

Adding to 421234243 its reverse (342432124), we get a palindrome (763666367).

The spelling of 421234243 in words is "four hundred twenty-one million, two hundred thirty-four thousand, two hundred forty-three".