442102340221 has 4 divisors (see below), whose sum is σ = 468108360252. Its totient is φ = 416096320192.

The previous prime is 442102340137. The next prime is 442102340279. The reversal of 442102340221 is 122043201244.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234266648121 + 207835692100 = 484011^2 + 455890^2 .

It is a cyclic number.

It is not a de Polignac number, because 442102340221 - 2⁹ = 442102339709 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 (442102380221) 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, 13003009990 + ... + 13003010023.

It is an arithmetic number, because the mean of its divisors is an integer number (117027090063).

Almost surely, 2^442102340221 is an apocalyptic number.

It is an amenable number.

442102340221 is a deficient number, since it is larger than the sum of its proper divisors (26006020031).

442102340221 is a wasteful number, since it uses less digits than its factorization.

442102340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26006020030.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 442102340221 its reverse (122043201244), we get a palindrome (564145541465).

The spelling of 442102340221 in words is "four hundred forty-two billion, one hundred two million, three hundred forty thousand, two hundred twenty-one".