42553321 has 4 divisors (see below), whose sum is σ = 42859600. Its totient is φ = 42247044.

The previous prime is 42553319. The next prime is 42553333. The reversal of 42553321 is 12335524.

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 a cyclic number.

It is not a de Polignac number, because 42553321 - 2¹ = 42553319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42553361) 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, 152931 + ... + 153208.

It is an arithmetic number, because the mean of its divisors is an integer number (10714900).

Almost surely, 2^42553321 is an apocalyptic number.

It is an amenable number.

42553321 is a deficient number, since it is larger than the sum of its proper divisors (306279).

42553321 is a wasteful number, since it uses less digits than its factorization.

42553321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306278.

The product of its digits is 3600, while the sum is 25.

The square root of 42553321 is about 6523.2906573293. The cubic root of 42553321 is about 349.1224847375.

Adding to 42553321 its reverse (12335524), we get a palindrome (54888845).

The spelling of 42553321 in words is "forty-two million, five hundred fifty-three thousand, three hundred twenty-one".