421504441 has 2 divisors, whose sum is σ = 421504442. Its totient is φ = 421504440.

The previous prime is 421504399. The next prime is 421504459. The reversal of 421504441 is 144405124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219040000 + 202464441 = 14800^2 + 14229^2 .

It is a cyclic number.

It is not a de Polignac number, because 421504441 - 2¹⁷ = 421373369 is a prime.

It is not a weakly prime, because it can be changed into another prime (421504541) 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, 210752220 + 210752221.

It is an arithmetic number, because the mean of its divisors is an integer number (210752221).

Almost surely, 2^421504441 is an apocalyptic number.

It is an amenable number.

421504441 is a deficient number, since it is larger than the sum of its proper divisors (1).

421504441 is an equidigital number, since it uses as much as digits as its factorization.

421504441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 421504441 is about 20530.5733237043. The cubic root of 421504441 is about 749.7803451568.

Adding to 421504441 its reverse (144405124), we get a palindrome (565909565).

The spelling of 421504441 in words is "four hundred twenty-one million, five hundred four thousand, four hundred forty-one".