442121123 has 4 divisors (see below), whose sum is σ = 442792680. Its totient is φ = 441449568.

The previous prime is 442121083. The next prime is 442121143. The reversal of 442121123 is 321121244.

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

It is a cyclic number.

It is not a de Polignac number, because 442121123 - 2⁶ = 442121059 is a prime.

It is a super-2 number, since 2×442121123² = 390942174805562258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442121095 and 442121104.

It is not an unprimeable number, because it can be changed into a prime (442121143) 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, 334790 + ... + 336107.

It is an arithmetic number, because the mean of its divisors is an integer number (110698170).

Almost surely, 2^442121123 is an apocalyptic number.

442121123 is a deficient number, since it is larger than the sum of its proper divisors (671557).

442121123 is an equidigital number, since it uses as much as digits as its factorization.

442121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671556.

The product of its digits is 384, while the sum is 20.

The square root of 442121123 is about 21026.6764611053. The cubic root of 442121123 is about 761.8107349307.

Adding to 442121123 its reverse (321121244), we get a palindrome (763242367).

It can be divided in two parts, 442121 and 123, that added together give a palindrome (442244).

The spelling of 442121123 in words is "four hundred forty-two million, one hundred twenty-one thousand, one hundred twenty-three".