442144021 has 4 divisors (see below), whose sum is σ = 482338944. Its totient is φ = 401949100.

The previous prime is 442143997. The next prime is 442144033. The reversal of 442144021 is 120441244.

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 442144021 - 2¹⁵ = 442111253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442143983 and 442144001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442144081) 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, 20097445 + ... + 20097466.

It is an arithmetic number, because the mean of its divisors is an integer number (120584736).

Almost surely, 2^442144021 is an apocalyptic number.

It is an amenable number.

442144021 is a deficient number, since it is larger than the sum of its proper divisors (40194923).

442144021 is a wasteful number, since it uses less digits than its factorization.

442144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40194922.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 442144021 is about 21027.2209528506. The cubic root of 442144021 is about 761.8238864105.

Adding to 442144021 its reverse (120441244), we get a palindrome (562585265).

The spelling of 442144021 in words is "four hundred forty-two million, one hundred forty-four thousand, twenty-one".