212121111100211 has 8 divisors (see below), whose sum is σ = 223086632423424. Its totient is φ = 201300828470280.

The previous prime is 212121111100189. The next prime is 212121111100243. The reversal of 212121111100211 is 112001111121212.

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 212121111100211 - 2⁶ = 212121111100147 is a prime.

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 212121111100211.

It is not an unprimeable number, because it can be changed into a prime (212121111100511) 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, 36309670325 + ... + 36309676166.

It is an arithmetic number, because the mean of its divisors is an integer number (27885829052928).

Almost surely, 2^{212121111100211} is an apocalyptic number.

212121111100211 is a deficient number, since it is larger than the sum of its proper divisors (10965521323213).

212121111100211 is a wasteful number, since it uses less digits than its factorization.

212121111100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72619346641.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212121111100211 its reverse (112001111121212), we get a palindrome (324122222221423).

The spelling of 212121111100211 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred eleven million, one hundred thousand, two hundred eleven".