421245403 has 2 divisors, whose sum is σ = 421245404. Its totient is φ = 421245402.

The previous prime is 421245379. The next prime is 421245413. The reversal of 421245403 is 304542124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421245403 - 2⁹ = 421244891 is a prime.

It is not a weakly prime, because it can be changed into another prime (421245413) 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, 210622701 + 210622702.

It is an arithmetic number, because the mean of its divisors is an integer number (210622702).

Almost surely, 2^421245403 is an apocalyptic number.

421245403 is a deficient number, since it is larger than the sum of its proper divisors (1).

421245403 is an equidigital number, since it uses as much as digits as its factorization.

421245403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 421245403 is about 20524.2637626786. The cubic root of 421245403 is about 749.6267197281.

Adding to 421245403 its reverse (304542124), we get a palindrome (725787527).

The spelling of 421245403 in words is "four hundred twenty-one million, two hundred forty-five thousand, four hundred three".