420521441 has 4 divisors (see below), whose sum is σ = 420782484. Its totient is φ = 420260400.

The previous prime is 420521407. The next prime is 420521527. The reversal of 420521441 is 144125024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313998400 + 106523041 = 17720^2 + 10321^2 .

It is a cyclic number.

It is not a de Polignac number, because 420521441 - 2⁶ = 420521377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420521341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128090 + ... + 131331.

It is an arithmetic number, because the mean of its divisors is an integer number (105195621).

Almost surely, 2^420521441 is an apocalyptic number.

It is an amenable number.

420521441 is a deficient number, since it is larger than the sum of its proper divisors (261043).

420521441 is a wasteful number, since it uses less digits than its factorization.

420521441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261042.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 420521441 is about 20506.6194434870. The cubic root of 420521441 is about 749.1970315921.

Adding to 420521441 its reverse (144125024), we get a palindrome (564646465).

The spelling of 420521441 in words is "four hundred twenty million, five hundred twenty-one thousand, four hundred forty-one".