42215225 has 12 divisors (see below), whose sum is σ = 56373996. Its totient is φ = 31174080.

The previous prime is 42215219. The next prime is 42215237. The reversal of 42215225 is 52251224.

It can be written as a sum of positive squares in 6 ways, for example, as 13227769 + 28987456 = 3637^2 + 5384^2 .

It is not a de Polignac number, because 42215225 - 2⁶ = 42215161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42215225.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 64622 + ... + 65271.

It is an arithmetic number, because the mean of its divisors is an integer number (4697833).

Almost surely, 2^42215225 is an apocalyptic number.

It is an amenable number.

42215225 is a deficient number, since it is larger than the sum of its proper divisors (14158771).

42215225 is a wasteful number, since it uses less digits than its factorization.

42215225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129916 (or 129911 counting only the distinct ones).

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

The square root of 42215225 is about 6497.3244493407. The cubic root of 42215225 is about 348.1954054069.

Adding to 42215225 its reverse (52251224), we get a palindrome (94466449).

The spelling of 42215225 in words is "forty-two million, two hundred fifteen thousand, two hundred twenty-five".