442123211 has 4 divisors (see below), whose sum is σ = 442525152. Its totient is φ = 441721272.

The previous prime is 442123207. The next prime is 442123223. The reversal of 442123211 is 112321244.

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

It is a cyclic number.

It is not a de Polignac number, because 442123211 - 2² = 442123207 is a prime.

It is a super-3 number, since 3×442123211³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442123261) 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, 199316 + ... + 201521.

It is an arithmetic number, because the mean of its divisors is an integer number (110631288).

Almost surely, 2^442123211 is an apocalyptic number.

442123211 is a deficient number, since it is larger than the sum of its proper divisors (401941).

442123211 is a wasteful number, since it uses less digits than its factorization.

442123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401940.

The product of its digits is 384, while the sum is 20.

The square root of 442123211 is about 21026.7261122601. The cubic root of 442123211 is about 761.8119341936.

Adding to 442123211 its reverse (112321244), we get a palindrome (554444455).

The spelling of 442123211 in words is "four hundred forty-two million, one hundred twenty-three thousand, two hundred eleven".