8421573 has 4 divisors (see below), whose sum is σ = 11228768. Its totient is φ = 5614380.

The previous prime is 8421563. The next prime is 8421577. The reversal of 8421573 is 3751248.

8421573 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8421573 - 2⁴ = 8421557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8421573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403593 + ... + 1403598.

It is an arithmetic number, because the mean of its divisors is an integer number (2807192).

Almost surely, 2^8421573 is an apocalyptic number.

It is an amenable number.

8421573 is a deficient number, since it is larger than the sum of its proper divisors (2807195).

8421573 is a wasteful number, since it uses less digits than its factorization.

8421573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807194.

The product of its digits is 6720, while the sum is 30.

The square root of 8421573 is about 2901.9946588510. The cubic root of 8421573 is about 203.4531441765.

It can be divided in two parts, 842 and 1573, that added together give a triangular number (2415 = T₆₉).

The spelling of 8421573 in words is "eight million, four hundred twenty-one thousand, five hundred seventy-three".