210110221121021 has 4 divisors (see below), whose sum is σ = 226272545822652. Its totient is φ = 193947896419392.

The previous prime is 210110221120979. The next prime is 210110221121029. The reversal of 210110221121021 is 120121122011012.

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 63762045592996 + 146348175528025 = 7985114^2 + 12097445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210110221121021 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 (210110221121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8081162350796 + ... + 8081162350821.

It is an arithmetic number, because the mean of its divisors is an integer number (56568136455663).

Almost surely, 2^{210110221121021} is an apocalyptic number.

It is an amenable number.

210110221121021 is a deficient number, since it is larger than the sum of its proper divisors (16162324701631).

210110221121021 is a wasteful number, since it uses less digits than its factorization.

210110221121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16162324701630.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210110221121021 its reverse (120121122011012), we get a palindrome (330231343132033).

The spelling of 210110221121021 in words is "two hundred ten trillion, one hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-one".