442101021 has 8 divisors (see below), whose sum is σ = 589792224. Its totient is φ = 294571920.

The previous prime is 442101019. The next prime is 442101043. The reversal of 442101021 is 120101244.

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

It is not a de Polignac number, because 442101021 - 2¹ = 442101019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442101521) 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, 34011 + ... + 45176.

It is an arithmetic number, because the mean of its divisors is an integer number (73724028).

Almost surely, 2^442101021 is an apocalyptic number.

It is an amenable number.

442101021 is a deficient number, since it is larger than the sum of its proper divisors (147691203).

442101021 is a wasteful number, since it uses less digits than its factorization.

442101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81051.

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

The square root of 442101021 is about 21026.1984438462. The cubic root of 442101021 is about 761.7991889609.

Adding to 442101021 its reverse (120101244), we get a palindrome (562202265).

The spelling of 442101021 in words is "four hundred forty-two million, one hundred one thousand, twenty-one".