42254021 has 4 divisors (see below), whose sum is σ = 42326592. Its totient is φ = 42181452.

The previous prime is 42253973. The next prime is 42254041. The reversal of 42254021 is 12045224.

It is a happy number.

42254021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42254021 - 2¹⁸ = 41991877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42253984 and 42254002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42254041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35405 + ... + 36578.

It is an arithmetic number, because the mean of its divisors is an integer number (10581648).

Almost surely, 2^42254021 is an apocalyptic number.

It is an amenable number.

42254021 is a deficient number, since it is larger than the sum of its proper divisors (72571).

42254021 is an equidigital number, since it uses as much as digits as its factorization.

42254021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72570.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42254021 is about 6500.3093003333. The cubic root of 42254021 is about 348.3020371802.

Adding to 42254021 its reverse (12045224), we get a palindrome (54299245).

The spelling of 42254021 in words is "forty-two million, two hundred fifty-four thousand, twenty-one".