210221110109 has 4 divisors (see below), whose sum is σ = 215348454300. Its totient is φ = 205093765920.

The previous prime is 210221110091. The next prime is 210221110129. The reversal of 210221110109 is 901011122012.

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 3193380100 + 207027730009 = 56510^2 + 455003^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221110109 - 2¹² = 210221106013 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 (210221110129) 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, 2563672034 + ... + 2563672115.

It is an arithmetic number, because the mean of its divisors is an integer number (53837113575).

Almost surely, 2^210221110109 is an apocalyptic number.

It is an amenable number.

210221110109 is a deficient number, since it is larger than the sum of its proper divisors (5127344191).

210221110109 is an equidigital number, since it uses as much as digits as its factorization.

210221110109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127344190.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 210221110109 in words is "two hundred ten billion, two hundred twenty-one million, one hundred ten thousand, one hundred nine".