442116521 has 16 divisors (see below), whose sum is σ = 552407040. Its totient is φ = 343758480.

The previous prime is 442116463. The next prime is 442116539. The reversal of 442116521 is 125611244.

It is a cyclic number.

It is not a de Polignac number, because 442116521 - 2⁶ = 442116457 is a prime.

It is a super-2 number, since 2×442116521² = 390934036282286882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442116541) 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, 30890 + ... + 42876.

It is an arithmetic number, because the mean of its divisors is an integer number (34525440).

Almost surely, 2^442116521 is an apocalyptic number.

It is an amenable number.

442116521 is a deficient number, since it is larger than the sum of its proper divisors (110290519).

442116521 is a wasteful number, since it uses less digits than its factorization.

442116521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12484.

The product of its digits is 1920, while the sum is 26.

The square root of 442116521 is about 21026.5670284048. The cubic root of 442116521 is about 761.8080917145.

Adding to 442116521 its reverse (125611244), we get a palindrome (567727765).

The spelling of 442116521 in words is "four hundred forty-two million, one hundred sixteen thousand, five hundred twenty-one".