442120421 has 8 divisors (see below), whose sum is σ = 462184704. Its totient is φ = 422126320.

The previous prime is 442120417. The next prime is 442120433. The reversal of 442120421 is 124021244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442120421 - 2² = 442120417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442120393 and 442120402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442120451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4445 + ... + 30066.

It is an arithmetic number, because the mean of its divisors is an integer number (57773088).

Almost surely, 2^442120421 is an apocalyptic number.

It is an amenable number.

442120421 is a deficient number, since it is larger than the sum of its proper divisors (20064283).

442120421 is a wasteful number, since it uses less digits than its factorization.

442120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35091.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 442120421 is about 21026.6597680183. The cubic root of 442120421 is about 761.8103317294.

Adding to 442120421 its reverse (124021244), we get a palindrome (566141665).

It can be divided in two parts, 4421 and 20421, that added together give a palindrome (24842).

The spelling of 442120421 in words is "four hundred forty-two million, one hundred twenty thousand, four hundred twenty-one".