42052221 has 6 divisors (see below), whose sum is σ = 60742110. Its totient is φ = 28034808.

The previous prime is 42052217. The next prime is 42052229. The reversal of 42052221 is 12225024.

42052221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 1028196 = 6405^2 + 1014^2 .

It is not a de Polignac number, because 42052221 - 2² = 42052217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42052194 and 42052203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42052229) 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 5 ways as a sum of consecutive naturals, for example, 2336226 + ... + 2336243.

It is an arithmetic number, because the mean of its divisors is an integer number (10123685).

Almost surely, 2^42052221 is an apocalyptic number.

It is an amenable number.

42052221 is a deficient number, since it is larger than the sum of its proper divisors (18689889).

42052221 is a wasteful number, since it uses less digits than its factorization.

42052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4672475 (or 4672472 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 42052221 is about 6484.7683844529. The cubic root of 42052221 is about 347.7466695738.

Adding to 42052221 its reverse (12225024), we get a palindrome (54277245).

The spelling of 42052221 in words is "forty-two million, fifty-two thousand, two hundred twenty-one".