421511225 has 24 divisors (see below), whose sum is σ = 546875712. Its totient is φ = 321675200.

The previous prime is 421511221. The next prime is 421511231. The reversal of 421511225 is 522115124.

It is not a de Polignac number, because 421511225 - 2² = 421511221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421511225.

It is not an unprimeable number, because it can be changed into a prime (421511221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281579 + ... + 283071.

It is an arithmetic number, because the mean of its divisors is an integer number (22786488).

Almost surely, 2^421511225 is an apocalyptic number.

It is an amenable number.

421511225 is a deficient number, since it is larger than the sum of its proper divisors (125364487).

421511225 is a wasteful number, since it uses less digits than its factorization.

421511225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2012 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 421511225 is about 20530.7385400526. The cubic root of 421511225 is about 749.7843676392.

Adding to 421511225 its reverse (522115124), we get a palindrome (943626349).

The spelling of 421511225 in words is "four hundred twenty-one million, five hundred eleven thousand, two hundred twenty-five".