42212185 has 4 divisors (see below), whose sum is σ = 50654628. Its totient is φ = 33769744.

The previous prime is 42212171. The next prime is 42212189. The reversal of 42212185 is 58121224.

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 25270729 + 16941456 = 5027^2 + 4116^2 .

It is a cyclic number.

It is not a de Polignac number, because 42212185 - 2¹¹ = 42210137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42212189) 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, 4221214 + ... + 4221223.

It is an arithmetic number, because the mean of its divisors is an integer number (12663657).

Almost surely, 2^42212185 is an apocalyptic number.

It is an amenable number.

42212185 is a deficient number, since it is larger than the sum of its proper divisors (8442443).

42212185 is an equidigital number, since it uses as much as digits as its factorization.

42212185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8442442.

The product of its digits is 1280, while the sum is 25.

The square root of 42212185 is about 6497.0905026789. The cubic root of 42212185 is about 348.1870471314.

The spelling of 42212185 in words is "forty-two million, two hundred twelve thousand, one hundred eighty-five".