210442041402221 has 4 divisors (see below), whose sum is σ = 210485333330844. Its totient is φ = 210398749473600.

The previous prime is 210442041402217. The next prime is 210442041402277. The reversal of 210442041402221 is 122204140244012.

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 200948032276996 + 9494009125225 = 14175614^2 + 3081235^2 .

It is a cyclic number.

It is not a de Polignac number, because 210442041402221 - 2² = 210442041402217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210442041402721) 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, 21645957020 + ... + 21645966741.

It is an arithmetic number, because the mean of its divisors is an integer number (52621333332711).

Almost surely, 2^{210442041402221} is an apocalyptic number.

It is an amenable number.

210442041402221 is a deficient number, since it is larger than the sum of its proper divisors (43291928623).

210442041402221 is an equidigital number, since it uses as much as digits as its factorization.

210442041402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43291928622.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 210442041402221 its reverse (122204140244012), we get a palindrome (332646181646233).

The spelling of 210442041402221 in words is "two hundred ten trillion, four hundred forty-two billion, forty-one million, four hundred two thousand, two hundred twenty-one".