421876521 has 24 divisors (see below), whose sum is σ = 665832960. Its totient is φ = 255276000.

The previous prime is 421876519. The next prime is 421876531. The reversal of 421876521 is 125678124.

It is not a de Polignac number, because 421876521 - 2¹ = 421876519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421876501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66360 + ... + 72438.

It is an arithmetic number, because the mean of its divisors is an integer number (27743040).

Almost surely, 2^421876521 is an apocalyptic number.

It is an amenable number.

421876521 is a deficient number, since it is larger than the sum of its proper divisors (243956439).

421876521 is a wasteful number, since it uses less digits than its factorization.

421876521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797 (or 6794 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 421876521 is about 20539.6329324552. The cubic root of 421876521 is about 750.0009013323. Note that the first 3 decimals are identical.

The spelling of 421876521 in words is "four hundred twenty-one million, eight hundred seventy-six thousand, five hundred twenty-one".