421402225 has 6 divisors (see below), whose sum is σ = 522538790. Its totient is φ = 337121760.

The previous prime is 421402217. The next prime is 421402231. The reversal of 421402225 is 522204124.

It can be written as a sum of positive squares in 3 ways, for example, as 43138624 + 378263601 = 6568^2 + 19449^2 .

It is not a de Polignac number, because 421402225 - 2³ = 421402217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421402196 and 421402205.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8428020 + ... + 8428069.

Almost surely, 2^421402225 is an apocalyptic number.

It is an amenable number.

421402225 is a deficient number, since it is larger than the sum of its proper divisors (101136565).

421402225 is a wasteful number, since it uses less digits than its factorization.

421402225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856099 (or 16856094 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 421402225 is about 20528.0838121828. The cubic root of 421402225 is about 749.7197323168.

Adding to 421402225 its reverse (522204124), we get a palindrome (943606349).

The spelling of 421402225 in words is "four hundred twenty-one million, four hundred two thousand, two hundred twenty-five".