42315121 has 4 divisors (see below), whose sum is σ = 42369012. Its totient is φ = 42261232.

The previous prime is 42315113. The next prime is 42315127. The reversal of 42315121 is 12151324.

42315121 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 can be written as a sum of positive squares in 2 ways, for example, as 26625600 + 15689521 = 5160^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 42315121 - 2³ = 42315113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42315127) 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, 25750 + ... + 27343.

It is an arithmetic number, because the mean of its divisors is an integer number (10592253).

Almost surely, 2^42315121 is an apocalyptic number.

It is an amenable number.

42315121 is a deficient number, since it is larger than the sum of its proper divisors (53891).

42315121 is an equidigital number, since it uses as much as digits as its factorization.

42315121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53890.

The product of its digits is 240, while the sum is 19.

The square root of 42315121 is about 6505.0073789351. The cubic root of 42315121 is about 348.4698397903.

Adding to 42315121 its reverse (12151324), we get a palindrome (54466445).

It can be divided in two parts, 42315 and 121, that added together give a square (42436 = 206²).

The spelling of 42315121 in words is "forty-two million, three hundred fifteen thousand, one hundred twenty-one".