421573 has 4 divisors (see below), whose sum is σ = 436140. Its totient is φ = 407008.

The previous prime is 421559. The next prime is 421607. The reversal of 421573 is 375124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 263169 = 398^2 + 513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421573 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421273) 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 3 ways as a sum of consecutive naturals, for example, 7240 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (109035).

2⁴²¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

421573 is a deficient number, since it is larger than the sum of its proper divisors (14567).

421573 is a wasteful number, since it uses less digits than its factorization.

421573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14566.

The product of its digits is 840, while the sum is 22.

The square root of 421573 is about 649.2865315098. The cubic root of 421573 is about 74.9820994316.

Adding to 421573 its reverse (375124), we get a palindrome (796697).

It can be divided in two parts, 42 and 1573, that multiplied together give a palindrome (66066).

The spelling of 421573 in words is "four hundred twenty-one thousand, five hundred seventy-three".