442013421 has 16 divisors (see below), whose sum is σ = 596185920. Its totient is φ = 291271680.

The previous prime is 442013393. The next prime is 442013441. The reversal of 442013421 is 124310244.

It is not a de Polignac number, because 442013421 - 2⁶ = 442013357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442013441) 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, 159181 + ... + 161933.

It is an arithmetic number, because the mean of its divisors is an integer number (37261620).

Almost surely, 2^442013421 is an apocalyptic number.

It is an amenable number.

442013421 is a deficient number, since it is larger than the sum of its proper divisors (154172499).

442013421 is a wasteful number, since it uses less digits than its factorization.

442013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 442013421 is about 21024.1152251409. The cubic root of 442013421 is about 761.7488701318.

Adding to 442013421 its reverse (124310244), we get a palindrome (566323665).

The spelling of 442013421 in words is "four hundred forty-two million, thirteen thousand, four hundred twenty-one".