442200221 has 4 divisors (see below), whose sum is σ = 449695200. Its totient is φ = 434705244.

The previous prime is 442200217. The next prime is 442200229. The reversal of 442200221 is 122002244.

It is a happy number.

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 442200221 - 2² = 442200217 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 442200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442200229) 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, 3747401 + ... + 3747518.

It is an arithmetic number, because the mean of its divisors is an integer number (112423800).

Almost surely, 2^442200221 is an apocalyptic number.

It is an amenable number.

442200221 is a deficient number, since it is larger than the sum of its proper divisors (7494979).

442200221 is an equidigital number, since it uses as much as digits as its factorization.

442200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7494978.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 442200221 is about 21028.5572733842. The cubic root of 442200221 is about 761.8561629890.

Adding to 442200221 its reverse (122002244), we get a palindrome (564202465).

The spelling of 442200221 in words is "four hundred forty-two million, two hundred thousand, two hundred twenty-one".