421006625 has 24 divisors (see below), whose sum is σ = 566946744. Its totient is φ = 310286400.

The previous prime is 421006583. The next prime is 421006631. The reversal of 421006625 is 526600124.

It can be written as a sum of positive squares in 12 ways, for example, as 239754256 + 181252369 = 15484^2 + 13463^2 .

It is not a de Polignac number, because 421006625 - 2¹² = 421002529 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 421006594 and 421006603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826871 + ... + 827379.

It is an arithmetic number, because the mean of its divisors is an integer number (23622781).

Almost surely, 2^421006625 is an apocalyptic number.

It is an amenable number.

421006625 is a deficient number, since it is larger than the sum of its proper divisors (145940119).

421006625 is an frugal number, since it uses more digits than its factorization.

421006625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 421006625 is about 20518.4459694198. The cubic root of 421006625 is about 749.4850539291.

Adding to 421006625 its reverse (526600124), we get a palindrome (947606749).

The spelling of 421006625 in words is "four hundred twenty-one million, six thousand, six hundred twenty-five".