42212321 has 4 divisors (see below), whose sum is σ = 42599700. Its totient is φ = 41824944.

The previous prime is 42212299. The next prime is 42212333. The reversal of 42212321 is 12321224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25361296 + 16851025 = 5036^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 42212321 - 2¹⁰ = 42211297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42212321.

It is not an unprimeable number, because it can be changed into a prime (42212351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193526 + ... + 193743.

It is an arithmetic number, because the mean of its divisors is an integer number (10649925).

Almost surely, 2^42212321 is an apocalyptic number.

It is an amenable number.

42212321 is a deficient number, since it is larger than the sum of its proper divisors (387379).

42212321 is a wasteful number, since it uses less digits than its factorization.

42212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387378.

The product of its digits is 192, while the sum is 17.

The square root of 42212321 is about 6497.1009688937. The cubic root of 42212321 is about 348.1874210629.

Adding to 42212321 its reverse (12321224), we get a palindrome (54533545).

The spelling of 42212321 in words is "forty-two million, two hundred twelve thousand, three hundred twenty-one".