12100112202221 has 4 divisors (see below), whose sum is σ = 12811883508252. Its totient is φ = 11388340896192.

The previous prime is 12100112202169. The next prime is 12100112202223. The reversal of 12100112202221 is 12220221100121.

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 8381053950025 + 3719058252196 = 2895005^2 + 1928486^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100112202221 - 2¹⁰ = 12100112201197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 711771306013 = 12100112202221 / (1 + 2 + 1 + 0 + 0 + 1 + 1 + 2 + 2 + 0 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12100112202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100112202223) 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, 355885652990 + ... + 355885653023.

It is an arithmetic number, because the mean of its divisors is an integer number (3202970877063).

Almost surely, 2^{12100112202221} is an apocalyptic number.

It is an amenable number.

12100112202221 is a deficient number, since it is larger than the sum of its proper divisors (711771306031).

12100112202221 is an equidigital number, since it uses as much as digits as its factorization.

12100112202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711771306030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12100112202221 its reverse (12220221100121), we get a palindrome (24320333302342).

The spelling of 12100112202221 in words is "twelve trillion, one hundred billion, one hundred twelve million, two hundred two thousand, two hundred twenty-one".