442005221 has 8 divisors (see below), whose sum is σ = 505431360. Its totient is φ = 378649728.

The previous prime is 442005217. The next prime is 442005229. The reversal of 442005221 is 122500244.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442005221 - 2² = 442005217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 442005193 and 442005202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442005229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3491 + ... + 29936.

It is an arithmetic number, because the mean of its divisors is an integer number (63178920).

Almost surely, 2^442005221 is an apocalyptic number.

It is an amenable number.

442005221 is a deficient number, since it is larger than the sum of its proper divisors (63426139).

442005221 is a wasteful number, since it uses less digits than its factorization.

442005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35323.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 442005221 is about 21023.9202100845. The cubic root of 442005221 is about 761.7441595815.

Adding to 442005221 its reverse (122500244), we get a palindrome (564505465).

The spelling of 442005221 in words is "four hundred forty-two million, five thousand, two hundred twenty-one".