42522221 has 4 divisors (see below), whose sum is σ = 48596832. Its totient is φ = 36447612.

The previous prime is 42522199. The next prime is 42522223. The reversal of 42522221 is 12222524.

42522221 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 42522221 - 2⁶ = 42522157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42522193 and 42522202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42522223) 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, 3037295 + ... + 3037308.

It is an arithmetic number, because the mean of its divisors is an integer number (12149208).

Almost surely, 2^42522221 is an apocalyptic number.

It is an amenable number.

42522221 is a deficient number, since it is larger than the sum of its proper divisors (6074611).

42522221 is an equidigital number, since it uses as much as digits as its factorization.

42522221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074610.

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

The square root of 42522221 is about 6520.9064553941. The cubic root of 42522221 is about 349.0374122120.

Adding to 42522221 its reverse (12222524), we get a palindrome (54744745).

The spelling of 42522221 in words is "forty-two million, five hundred twenty-two thousand, two hundred twenty-one".