442001121 has 4 divisors (see below), whose sum is σ = 589334832. Its totient is φ = 294667412.

The previous prime is 442001117. The next prime is 442001137. The reversal of 442001121 is 121100244.

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 442001121 - 2² = 442001117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442001121.

It is not an unprimeable number, because it can be changed into a prime (442001111) 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, 73666851 + ... + 73666856.

It is an arithmetic number, because the mean of its divisors is an integer number (147333708).

Almost surely, 2^442001121 is an apocalyptic number.

It is an amenable number.

442001121 is a deficient number, since it is larger than the sum of its proper divisors (147333711).

442001121 is a wasteful number, since it uses less digits than its factorization.

442001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147333710.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 442001121 is about 21023.8227018780. The cubic root of 442001121 is about 761.7418042845.

Adding to 442001121 its reverse (121100244), we get a palindrome (563101365).

The spelling of 442001121 in words is "four hundred forty-two million, one thousand, one hundred twenty-one".