442232021 has 16 divisors (see below), whose sum is σ = 557047680. Its totient is φ = 341038080.

The previous prime is 442232009. The next prime is 442232047. The reversal of 442232021 is 120232244.

It is a cyclic number.

It is not a de Polignac number, because 442232021 - 2¹⁸ = 441969877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442231984 and 442232002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442232221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22136 + ... + 37073.

It is an arithmetic number, because the mean of its divisors is an integer number (34815480).

Almost surely, 2^442232021 is an apocalyptic number.

It is an amenable number.

442232021 is a deficient number, since it is larger than the sum of its proper divisors (114815659).

442232021 is a wasteful number, since it uses less digits than its factorization.

442232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59324.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 442232021 is about 21029.3133744305. The cubic root of 442232021 is about 761.8744250372.

Adding to 442232021 its reverse (120232244), we get a palindrome (562464265).

The spelling of 442232021 in words is "four hundred forty-two million, two hundred thirty-two thousand, twenty-one".