210442104121 has 4 divisors (see below), whose sum is σ = 210446499700. Its totient is φ = 210437708544.

The previous prime is 210442104113. The next prime is 210442104133. The reversal of 210442104121 is 121401244012.

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 205604206096 + 4837898025 = 453436^2 + 69555^2 .

It is a cyclic number.

It is not a de Polignac number, because 210442104121 - 2³ = 210442104113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210442104092 and 210442104101.

It is not an unprimeable number, because it can be changed into a prime (210442104181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125176 + ... + 2221993.

It is an arithmetic number, because the mean of its divisors is an integer number (52611624925).

Almost surely, 2^210442104121 is an apocalyptic number.

It is an amenable number.

210442104121 is a deficient number, since it is larger than the sum of its proper divisors (4395579).

210442104121 is an equidigital number, since it uses as much as digits as its factorization.

210442104121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395578.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 210442104121 its reverse (121401244012), we get a palindrome (331843348133).

The spelling of 210442104121 in words is "two hundred ten billion, four hundred forty-two million, one hundred four thousand, one hundred twenty-one".