421570321 has 8 divisors (see below), whose sum is σ = 429969384. Its totient is φ = 413187840.

The previous prime is 421570273. The next prime is 421570339. The reversal of 421570321 is 123075124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3940225 + 417630096 = 1985^2 + 20436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421570321 - 2¹⁹ = 421046033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421570421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55641 + ... + 62761.

It is an arithmetic number, because the mean of its divisors is an integer number (53746173).

Almost surely, 2^421570321 is an apocalyptic number.

It is an amenable number.

421570321 is a deficient number, since it is larger than the sum of its proper divisors (8399063).

421570321 is a wasteful number, since it uses less digits than its factorization.

421570321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 421570321 is about 20532.1776974582. The cubic root of 421570321 is about 749.8194059994.

The spelling of 421570321 in words is "four hundred twenty-one million, five hundred seventy thousand, three hundred twenty-one".