42553421 has 8 divisors (see below), whose sum is σ = 44364288. Its totient is φ = 40770000.

The previous prime is 42553409. The next prime is 42553451. The reversal of 42553421 is 12435524.

It is a happy number.

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 42553421 - 2¹⁰ = 42552397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42553451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3665 + ... + 9926.

It is an arithmetic number, because the mean of its divisors is an integer number (5545536).

Almost surely, 2^42553421 is an apocalyptic number.

It is an amenable number.

42553421 is a deficient number, since it is larger than the sum of its proper divisors (1810867).

42553421 is a wasteful number, since it uses less digits than its factorization.

42553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13723.

The product of its digits is 4800, while the sum is 26.

The square root of 42553421 is about 6523.2983221680. The cubic root of 42553421 is about 349.1227582157.

Adding to 42553421 its reverse (12435524), we get a palindrome (54988945).

The spelling of 42553421 in words is "forty-two million, five hundred fifty-three thousand, four hundred twenty-one".