442121101 has 4 divisors (see below), whose sum is σ = 456383104. Its totient is φ = 427859100.

The previous prime is 442121083. The next prime is 442121143. The reversal of 442121101 is 101121244.

It is a happy number.

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-442121101 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 (442121191) 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, 7130955 + ... + 7131016.

It is an arithmetic number, because the mean of its divisors is an integer number (114095776).

Almost surely, 2^442121101 is an apocalyptic number.

It is an amenable number.

442121101 is a deficient number, since it is larger than the sum of its proper divisors (14262003).

442121101 is a wasteful number, since it uses less digits than its factorization.

442121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14262002.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 442121101 is about 21026.6759379603. The cubic root of 442121101 is about 761.8107222948.

Adding to 442121101 its reverse (101121244), we get a palindrome (543242345).

The spelling of 442121101 in words is "four hundred forty-two million, one hundred twenty-one thousand, one hundred one".