42131121 has 4 divisors (see below), whose sum is σ = 56174832. Its totient is φ = 28087412.

The previous prime is 42131119. The next prime is 42131153. The reversal of 42131121 is 12113124.

42131121 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42131121 - 2¹ = 42131119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42131121.

It is not an unprimeable number, because it can be changed into a prime (42131161) 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, 7021851 + ... + 7021856.

It is an arithmetic number, because the mean of its divisors is an integer number (14043708).

Almost surely, 2^42131121 is an apocalyptic number.

It is an amenable number.

42131121 is a deficient number, since it is larger than the sum of its proper divisors (14043711).

42131121 is a wasteful number, since it uses less digits than its factorization.

42131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043710.

The product of its digits is 48, while the sum is 15.

The square root of 42131121 is about 6490.8490199665. The cubic root of 42131121 is about 347.9640189381.

Adding to 42131121 its reverse (12113124), we get a palindrome (54244245).

The spelling of 42131121 in words is "forty-two million, one hundred thirty-one thousand, one hundred twenty-one".