42251121 has 12 divisors (see below), whose sum is σ = 66577680. Its totient is φ = 25606680.

The previous prime is 42251119. The next prime is 42251149. The reversal of 42251121 is 12115224.

It is not a de Polignac number, because 42251121 - 2¹ = 42251119 is a prime.

It is a super-3 number, since 3×42251121³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42251094 and 42251103.

It is not an unprimeable number, because it can be changed into a prime (42251191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213291 + ... + 213488.

It is an arithmetic number, because the mean of its divisors is an integer number (5548140).

Almost surely, 2^42251121 is an apocalyptic number.

It is an amenable number.

42251121 is a deficient number, since it is larger than the sum of its proper divisors (24326559).

42251121 is a wasteful number, since it uses less digits than its factorization.

42251121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426796 (or 426793 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 42251121 is about 6500.0862301973. The cubic root of 42251121 is about 348.2940687156.

Adding to 42251121 its reverse (12115224), we get a palindrome (54366345).

The spelling of 42251121 in words is "forty-two million, two hundred fifty-one thousand, one hundred twenty-one".