42421573 has 4 divisors (see below), whose sum is σ = 43568140. Its totient is φ = 41275008.

The previous prime is 42421559. The next prime is 42421619. The reversal of 42421573 is 37512424.

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 21325924 + 21095649 = 4618^2 + 4593^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421573 - 2¹³ = 42413381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42421553) 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, 573228 + ... + 573301.

It is an arithmetic number, because the mean of its divisors is an integer number (10892035).

Almost surely, 2^42421573 is an apocalyptic number.

It is an amenable number.

42421573 is a deficient number, since it is larger than the sum of its proper divisors (1146567).

42421573 is a wasteful number, since it uses less digits than its factorization.

42421573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146566.

The product of its digits is 6720, while the sum is 28.

The square root of 42421573 is about 6513.1845513543. The cubic root of 42421573 is about 348.7618098714.

Adding to 42421573 its reverse (37512424), we get a palindrome (79933997).

The spelling of 42421573 in words is "forty-two million, four hundred twenty-one thousand, five hundred seventy-three".