420521425 has 6 divisors (see below), whose sum is σ = 521446598. Its totient is φ = 336417120.

The previous prime is 420521407. The next prime is 420521527. The reversal of 420521425 is 524125024.

It can be written as a sum of positive squares in 3 ways, for example, as 74114881 + 346406544 = 8609^2 + 18612^2 .

It is not a de Polignac number, because 420521425 - 2⁵ = 420521393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 16820857 = 420521425 / (4 + 2 + 0 + 5 + 2 + 1 + 4 + 2 + 5).

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 420521425.

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, 8410404 + ... + 8410453.

Almost surely, 2^420521425 is an apocalyptic number.

It is an amenable number.

420521425 is a deficient number, since it is larger than the sum of its proper divisors (100925173).

420521425 is a wasteful number, since it uses less digits than its factorization.

420521425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16820867 (or 16820862 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 420521425 is about 20506.6190533691. The cubic root of 420521425 is about 749.1970220903.

Adding to 420521425 its reverse (524125024), we get a palindrome (944646449).

The spelling of 420521425 in words is "four hundred twenty million, five hundred twenty-one thousand, four hundred twenty-five".