421242403 has 2 divisors, whose sum is σ = 421242404. Its totient is φ = 421242402.

The previous prime is 421242377. The next prime is 421242431. The reversal of 421242403 is 304242124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421242403 - 2¹⁷ = 421111331 is a prime.

It is not a weakly prime, because it can be changed into another prime (421242443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210621201 + 210621202.

It is an arithmetic number, because the mean of its divisors is an integer number (210621202).

Almost surely, 2^421242403 is an apocalyptic number.

421242403 is a deficient number, since it is larger than the sum of its proper divisors (1).

421242403 is an equidigital number, since it uses as much as digits as its factorization.

421242403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421242403 is about 20524.1906783191. The cubic root of 421242403 is about 749.6249401751.

Adding to 421242403 its reverse (304242124), we get a palindrome (725484527).

The spelling of 421242403 in words is "four hundred twenty-one million, two hundred forty-two thousand, four hundred three".