442321213 has 4 divisors (see below), whose sum is σ = 445503520. Its totient is φ = 439138908.

The previous prime is 442321151. The next prime is 442321223. The reversal of 442321213 is 312123244.

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 442321213 - 2⁹ = 442320701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442321223) 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, 1590945 + ... + 1591222.

It is an arithmetic number, because the mean of its divisors is an integer number (111375880).

Almost surely, 2^442321213 is an apocalyptic number.

It is an amenable number.

442321213 is a deficient number, since it is larger than the sum of its proper divisors (3182307).

442321213 is a wasteful number, since it uses less digits than its factorization.

442321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182306.

The product of its digits is 1152, while the sum is 22.

The square root of 442321213 is about 21031.4339263874. The cubic root of 442321213 is about 761.9256413917.

Adding to 442321213 its reverse (312123244), we get a palindrome (754444457).

The spelling of 442321213 in words is "four hundred forty-two million, three hundred twenty-one thousand, two hundred thirteen".