421421825 has 18 divisors (see below), whose sum is σ = 574391622. Its totient is φ = 306486400.

The previous prime is 421421813. The next prime is 421421831. The reversal of 421421825 is 528124124.

It can be written as a sum of positive squares in 3 ways, for example, as 83156161 + 338265664 = 9119^2 + 18392^2 .

It is not a de Polignac number, because 421421825 - 2¹² = 421417729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 66632 + ... + 72681.

Almost surely, 2^421421825 is an apocalyptic number.

It is an amenable number.

421421825 is a deficient number, since it is larger than the sum of its proper divisors (152969797).

421421825 is a wasteful number, since it uses less digits than its factorization.

421421825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139345 (or 139329 counting only the distinct ones).

The product of its digits is 5120, while the sum is 29.

The square root of 421421825 is about 20528.5612014091. The cubic root of 421421825 is about 749.7313556369.

Adding to 421421825 its reverse (528124124), we get a palindrome (949545949).

The spelling of 421421825 in words is "four hundred twenty-one million, four hundred twenty-one thousand, eight hundred twenty-five".