42851121 has 4 divisors (see below), whose sum is σ = 57134832. Its totient is φ = 28567412.

The previous prime is 42851119. The next prime is 42851129. The reversal of 42851121 is 12115824.

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 42851121 - 2¹ = 42851119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42851091 and 42851100.

It is not an unprimeable number, because it can be changed into a prime (42851129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7141851 + ... + 7141856.

It is an arithmetic number, because the mean of its divisors is an integer number (14283708).

Almost surely, 2^42851121 is an apocalyptic number.

It is an amenable number.

42851121 is a deficient number, since it is larger than the sum of its proper divisors (14283711).

42851121 is a wasteful number, since it uses less digits than its factorization.

42851121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14283710.

The product of its digits is 640, while the sum is 24.

The square root of 42851121 is about 6546.0767639862. The cubic root of 42851121 is about 349.9350110627.

Adding to 42851121 its reverse (12115824), we get a palindrome (54966945).

The spelling of 42851121 in words is "forty-two million, eight hundred fifty-one thousand, one hundred twenty-one".