42242321 has 4 divisors (see below), whose sum is σ = 46082544. Its totient is φ = 38402100.

The previous prime is 42242311. The next prime is 42242351. The reversal of 42242321 is 12324224.

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 de Polignac number, because none of the positive numbers 2^k-42242321 is a prime.

It is a super-3 number, since 3×42242321³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42242293 and 42242302.

It is not an unprimeable number, because it can be changed into a prime (42242311) 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, 1920095 + ... + 1920116.

It is an arithmetic number, because the mean of its divisors is an integer number (11520636).

Almost surely, 2^42242321 is an apocalyptic number.

It is an amenable number.

42242321 is a deficient number, since it is larger than the sum of its proper divisors (3840223).

42242321 is a wasteful number, since it uses less digits than its factorization.

42242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840222.

The product of its digits is 768, while the sum is 20.

The square root of 42242321 is about 6499.4092808501. The cubic root of 42242321 is about 348.2698863148.

Adding to 42242321 its reverse (12324224), we get a palindrome (54566545).

The spelling of 42242321 in words is "forty-two million, two hundred forty-two thousand, three hundred twenty-one".