421631425 has 12 divisors (see below), whose sum is σ = 523119420. Its totient is φ = 337113920.

The previous prime is 421631387. The next prime is 421631443. The reversal of 421631425 is 524136124.

It can be written as a sum of positive squares in 6 ways, for example, as 9054081 + 412577344 = 3009^2 + 20312^2 .

It is a de Polignac number, because none of the positive numbers 2^k-421631425 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421631393 and 421631402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54711 + ... + 61939.

It is an arithmetic number, because the mean of its divisors is an integer number (43593285).

Almost surely, 2^421631425 is an apocalyptic number.

It is an amenable number.

421631425 is a deficient number, since it is larger than the sum of its proper divisors (101487995).

421631425 is a wasteful number, since it uses less digits than its factorization.

421631425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572 (or 9567 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 421631425 is about 20533.6656493671. The cubic root of 421631425 is about 749.8556314713.

Adding to 421631425 its reverse (524136124), we get a palindrome (945767549).

The spelling of 421631425 in words is "four hundred twenty-one million, six hundred thirty-one thousand, four hundred twenty-five".