212101100202221 has 8 divisors (see below), whose sum is σ = 224577880312320. Its totient is φ = 199624347292608.

The previous prime is 212101100202203. The next prime is 212101100202227. The reversal of 212101100202221 is 122202001101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212101100202221 - 2³⁸ = 211826222295277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 212101100202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101100202227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10513460 + ... + 23124338.

It is an arithmetic number, because the mean of its divisors is an integer number (28072235039040).

Almost surely, 2^{212101100202221} is an apocalyptic number.

It is an amenable number.

212101100202221 is a deficient number, since it is larger than the sum of its proper divisors (12476780110099).

212101100202221 is a wasteful number, since it uses less digits than its factorization.

212101100202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13600243.

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

Adding to 212101100202221 its reverse (122202001101212), we get a palindrome (334303101303433).

The spelling of 212101100202221 in words is "two hundred twelve trillion, one hundred one billion, one hundred million, two hundred two thousand, two hundred twenty-one".