442002421 has 8 divisors (see below), whose sum is σ = 505479744. Its totient is φ = 378608640.

The previous prime is 442002419. The next prime is 442002437. The reversal of 442002421 is 124200244.

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 442002421 - 2¹ = 442002419 is a prime.

It is a super-2 number, since 2×442002421² = 390732280339722482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442002721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9100 + ... + 31093.

It is an arithmetic number, because the mean of its divisors is an integer number (63184968).

Almost surely, 2^442002421 is an apocalyptic number.

It is an amenable number.

442002421 is a deficient number, since it is larger than the sum of its proper divisors (63477323).

442002421 is a wasteful number, since it uses less digits than its factorization.

442002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41771.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 442002421 is about 21023.8536191632. The cubic root of 442002421 is about 761.7425510876.

Adding to 442002421 its reverse (124200244), we get a palindrome (566202665).

The spelling of 442002421 in words is "four hundred forty-two million, two thousand, four hundred twenty-one".