42554021 has 4 divisors (see below), whose sum is σ = 42800172. Its totient is φ = 42307872.

The previous prime is 42554003. The next prime is 42554069. The reversal of 42554021 is 12045524.

It is a happy number.

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 28408900 + 14145121 = 5330^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 42554021 - 2⁶ = 42553957 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 (42554321) 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, 122816 + ... + 123161.

It is an arithmetic number, because the mean of its divisors is an integer number (10700043).

Almost surely, 2^42554021 is an apocalyptic number.

It is an amenable number.

42554021 is a deficient number, since it is larger than the sum of its proper divisors (246151).

42554021 is a wasteful number, since it uses less digits than its factorization.

42554021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246150.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42554021 is about 6523.3443110110. The cubic root of 42554021 is about 349.1243990761.

Adding to 42554021 its reverse (12045524), we get a palindrome (54599545).

The spelling of 42554021 in words is "forty-two million, five hundred fifty-four thousand, twenty-one".