42126251 has 4 divisors (see below), whose sum is σ = 42378672. Its totient is φ = 41873832.

The previous prime is 42126223. The next prime is 42126263. The reversal of 42126251 is 15262124.

It is a happy number.

42126251 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 42126251 - 2¹⁰ = 42125227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42126151) 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, 125960 + ... + 126293.

It is an arithmetic number, because the mean of its divisors is an integer number (10594668).

Almost surely, 2^42126251 is an apocalyptic number.

42126251 is a deficient number, since it is larger than the sum of its proper divisors (252421).

42126251 is a wasteful number, since it uses less digits than its factorization.

42126251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252420.

The product of its digits is 960, while the sum is 23.

The square root of 42126251 is about 6490.4738655972. The cubic root of 42126251 is about 347.9506111924.

Adding to 42126251 its reverse (15262124), we get a palindrome (57388375).

The spelling of 42126251 in words is "forty-two million, one hundred twenty-six thousand, two hundred fifty-one".