442212121 has 8 divisors (see below), whose sum is σ = 477915200. Its totient is φ = 406750032.

The previous prime is 442212103. The next prime is 442212149. The reversal of 442212121 is 121212244.

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

It is a de Polignac number, because none of the positive numbers 2^k-442212121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442212151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56421 + ... + 63778.

It is an arithmetic number, because the mean of its divisors is an integer number (59739400).

Almost surely, 2^442212121 is an apocalyptic number.

It is an amenable number.

442212121 is a deficient number, since it is larger than the sum of its proper divisors (35703079).

442212121 is a wasteful number, since it uses less digits than its factorization.

442212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120495.

The product of its digits is 256, while the sum is 19.

The square root of 442212121 is about 21028.8402200407. The cubic root of 442212121 is about 761.8629970026.

Adding to 442212121 its reverse (121212244), we get a palindrome (563424365).

The spelling of 442212121 in words is "four hundred forty-two million, two hundred twelve thousand, one hundred twenty-one".