421716025 has 18 divisors (see below), whose sum is σ = 555507290. Its totient is φ = 317521920.

The previous prime is 421715977. The next prime is 421716049. The reversal of 421716025 is 520617124.

It can be written as a sum of positive squares in 9 ways, for example, as 19954089 + 401761936 = 4467^2 + 20044^2 .

It is not a de Polignac number, because 421716025 - 2⁷ = 421715897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421715984 and 421716002.

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, 21960 + ... + 36409.

Almost surely, 2^421716025 is an apocalyptic number.

It is an amenable number.

421716025 is a deficient number, since it is larger than the sum of its proper divisors (133791265).

421716025 is a wasteful number, since it uses less digits than its factorization.

421716025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58413 (or 58391 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 421716025 is about 20535.7255776366. The cubic root of 421716025 is about 749.9057807567.

The spelling of 421716025 in words is "four hundred twenty-one million, seven hundred sixteen thousand, twenty-five".