421424125 has 8 divisors (see below), whose sum is σ = 525937464. Its totient is φ = 337139200.

The previous prime is 421424093. The next prime is 421424141. The reversal of 421424125 is 521424124.

It can be written as a sum of positive squares in 4 ways, for example, as 95296644 + 326127481 = 9762^2 + 18059^2 .

It is not a de Polignac number, because 421424125 - 2⁵ = 421424093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 421424125.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685572 + ... + 1685821.

It is an arithmetic number, because the mean of its divisors is an integer number (65742183).

Almost surely, 2^421424125 is an apocalyptic number.

It is an amenable number.

421424125 is a deficient number, since it is larger than the sum of its proper divisors (104513339).

421424125 is an equidigital number, since it uses as much as digits as its factorization.

421424125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371408 (or 3371398 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 421424125 is about 20528.6172208456. The cubic root of 421424125 is about 749.7327195744.

Adding to 421424125 its reverse (521424124), we get a palindrome (942848249).

Subtracting 421424125 from its reverse (521424124), we obtain a palindrome (99999999).

The spelling of 421424125 in words is "four hundred twenty-one million, four hundred twenty-four thousand, one hundred twenty-five".