42120115 has 4 divisors (see below), whose sum is σ = 50544144. Its totient is φ = 33696088.

The previous prime is 42120083. The next prime is 42120119. The reversal of 42120115 is 51102124.

42120115 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.

It is a cyclic number.

It is not a de Polignac number, because 42120115 - 2⁵ = 42120083 is a prime.

It is a super-2 number, since 2×42120115² = 3548208175226450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120119) 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, 4212007 + ... + 4212016.

It is an arithmetic number, because the mean of its divisors is an integer number (12636036).

Almost surely, 2^42120115 is an apocalyptic number.

42120115 is a deficient number, since it is larger than the sum of its proper divisors (8424029).

42120115 is an equidigital number, since it uses as much as digits as its factorization.

42120115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424028.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 42120115 is about 6490.0011556239. The cubic root of 42120115 is about 347.9337165122.

Adding to 42120115 its reverse (51102124), we get a palindrome (93222239).

Subtracting 42120115 from its reverse (51102124), we obtain a square (8982009 = 2997²).

The spelling of 42120115 in words is "forty-two million, one hundred twenty thousand, one hundred fifteen".