42252121 has 4 divisors (see below), whose sum is σ = 42267600. Its totient is φ = 42236644.

The previous prime is 42252109. The next prime is 42252137. The reversal of 42252121 is 12125224.

42252121 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 42252121 - 2¹¹ = 42250073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42252151) 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, 2431 + ... + 9508.

It is an arithmetic number, because the mean of its divisors is an integer number (10566900).

Almost surely, 2^42252121 is an apocalyptic number.

It is an amenable number.

42252121 is a deficient number, since it is larger than the sum of its proper divisors (15479).

42252121 is a wasteful number, since it uses less digits than its factorization.

42252121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15478.

The product of its digits is 320, while the sum is 19.

The square root of 42252121 is about 6500.1631517986. The cubic root of 42252121 is about 348.2968165032.

Adding to 42252121 its reverse (12125224), we get a palindrome (54377345).

The spelling of 42252121 in words is "forty-two million, two hundred fifty-two thousand, one hundred twenty-one".