211102120205 has 4 divisors (see below), whose sum is σ = 253322544252. Its totient is φ = 168881696160.

The previous prime is 211102120193. The next prime is 211102120211. The reversal of 211102120205 is 502021201112.

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 159733710889 + 51368409316 = 399667^2 + 226646^2 .

It is not a de Polignac number, because 211102120205 - 2¹⁰ = 211102119181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21110212016 + ... + 21110212025.

It is an arithmetic number, because the mean of its divisors is an integer number (63330636063).

Almost surely, 2^211102120205 is an apocalyptic number.

It is an amenable number.

211102120205 is a deficient number, since it is larger than the sum of its proper divisors (42220424047).

211102120205 is an equidigital number, since it uses as much as digits as its factorization.

211102120205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42220424046.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 211102120205 its reverse (502021201112), we get a palindrome (713123321317).

The spelling of 211102120205 in words is "two hundred eleven billion, one hundred two million, one hundred twenty thousand, two hundred five".