442132021 has 4 divisors (see below), whose sum is σ = 445099500. Its totient is φ = 439164544.

The previous prime is 442132003. The next prime is 442132043. The reversal of 442132021 is 120231244.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161569521 + 280562500 = 12711^2 + 16750^2 .

It is a cyclic number.

It is not a de Polignac number, because 442132021 - 2⁹ = 442131509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442132021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442132001) 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, 1483516 + ... + 1483813.

It is an arithmetic number, because the mean of its divisors is an integer number (111274875).

Almost surely, 2^442132021 is an apocalyptic number.

It is an amenable number.

442132021 is a deficient number, since it is larger than the sum of its proper divisors (2967479).

442132021 is a wasteful number, since it uses less digits than its factorization.

442132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967478.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 442132021 is about 21026.9356065024. The cubic root of 442132021 is about 761.8169942601.

Adding to 442132021 its reverse (120231244), we get a palindrome (562363265).

The spelling of 442132021 in words is "four hundred forty-two million, one hundred thirty-two thousand, twenty-one".