442112421 has 16 divisors (see below), whose sum is σ = 644295168. Its totient is φ = 268454400.

The previous prime is 442112401. The next prime is 442112423. The reversal of 442112421 is 124211244.

It is not a de Polignac number, because 442112421 - 2⁶ = 442112357 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 (442112423) 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, 138240 + ... + 141401.

It is an arithmetic number, because the mean of its divisors is an integer number (40268448).

Almost surely, 2^442112421 is an apocalyptic number.

It is an amenable number.

442112421 is a deficient number, since it is larger than the sum of its proper divisors (202182747).

442112421 is a wasteful number, since it uses less digits than its factorization.

442112421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279692.

The product of its digits is 512, while the sum is 21.

The square root of 442112421 is about 21026.4695324726. The cubic root of 442112421 is about 761.8057368128.

Adding to 442112421 its reverse (124211244), we get a palindrome (566323665).

The spelling of 442112421 in words is "four hundred forty-two million, one hundred twelve thousand, four hundred twenty-one".