421236433 has 2 divisors, whose sum is σ = 421236434. Its totient is φ = 421236432.

The previous prime is 421236427. The next prime is 421236449. The reversal of 421236433 is 334632124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286861969 + 134374464 = 16937^2 + 11592^2 .

It is a cyclic number.

It is not a de Polignac number, because 421236433 - 2⁹ = 421235921 is a prime.

It is not a weakly prime, because it can be changed into another prime (421236533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210618216 + 210618217.

It is an arithmetic number, because the mean of its divisors is an integer number (210618217).

Almost surely, 2^421236433 is an apocalyptic number.

It is an amenable number.

421236433 is a deficient number, since it is larger than the sum of its proper divisors (1).

421236433 is an equidigital number, since it uses as much as digits as its factorization.

421236433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 28.

The square root of 421236433 is about 20524.0452396695. The cubic root of 421236433 is about 749.6213988396.

Adding to 421236433 its reverse (334632124), we get a palindrome (755868557).

The spelling of 421236433 in words is "four hundred twenty-one million, two hundred thirty-six thousand, four hundred thirty-three".