42242131 has 4 divisors (see below), whose sum is σ = 42297552. Its totient is φ = 42186712.

The previous prime is 42242087. The next prime is 42242141. The reversal of 42242131 is 13124224.

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 42242131 - 2²⁵ = 8687699 is a prime.

It is a super-2 number, since 2×42242131² = 3568795262842322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42242099 and 42242108.

It is not an unprimeable number, because it can be changed into a prime (42242141) 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, 26551 + ... + 28096.

It is an arithmetic number, because the mean of its divisors is an integer number (10574388).

Almost surely, 2^42242131 is an apocalyptic number.

42242131 is a deficient number, since it is larger than the sum of its proper divisors (55421).

42242131 is an equidigital number, since it uses as much as digits as its factorization.

42242131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55420.

The product of its digits is 384, while the sum is 19.

The square root of 42242131 is about 6499.3946641207. The cubic root of 42242131 is about 348.2693641578.

Adding to 42242131 its reverse (13124224), we get a palindrome (55366355).

The spelling of 42242131 in words is "forty-two million, two hundred forty-two thousand, one hundred thirty-one".