421006441 has 2 divisors, whose sum is σ = 421006442. Its totient is φ = 421006440.

The previous prime is 421006433. The next prime is 421006447. The reversal of 421006441 is 144600124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295118041 + 125888400 = 17179^2 + 11220^2 .

It is a cyclic number.

It is not a de Polignac number, because 421006441 - 2³ = 421006433 is a prime.

It is not a weakly prime, because it can be changed into another prime (421006447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210503220 + 210503221.

It is an arithmetic number, because the mean of its divisors is an integer number (210503221).

Almost surely, 2^421006441 is an apocalyptic number.

It is an amenable number.

421006441 is a deficient number, since it is larger than the sum of its proper divisors (1).

421006441 is an equidigital number, since it uses as much as digits as its factorization.

421006441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 421006441 is about 20518.4414856490. The cubic root of 421006441 is about 749.4849447421.

Adding to 421006441 its reverse (144600124), we get a palindrome (565606565).

The spelling of 421006441 in words is "four hundred twenty-one million, six thousand, four hundred forty-one".