442431323220221 has 4 divisors (see below), whose sum is σ = 442435819069344. Its totient is φ = 442426827371100.

The previous prime is 442431323220191. The next prime is 442431323220247. The reversal of 442431323220221 is 122022323134244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442431323220221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442431323210221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2247776945 + ... + 2247973766.

It is an arithmetic number, because the mean of its divisors is an integer number (110608954767336).

Almost surely, 2^{442431323220221} is an apocalyptic number.

It is an amenable number.

442431323220221 is a deficient number, since it is larger than the sum of its proper divisors (4495849123).

442431323220221 is an equidigital number, since it uses as much as digits as its factorization.

442431323220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495849122.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 442431323220221 its reverse (122022323134244), we get a palindrome (564453646354465).

The spelling of 442431323220221 in words is "four hundred forty-two trillion, four hundred thirty-one billion, three hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".