2121212112211 has 4 divisors (see below), whose sum is σ = 2124162338400. Its totient is φ = 2118261886024.

The previous prime is 2121212112199. The next prime is 2121212112251. The reversal of 2121212112211 is 1122112121212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121212112211 - 2¹⁵ = 2121212079443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121212112251) 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, 1475112016 + ... + 1475113453.

It is an arithmetic number, because the mean of its divisors is an integer number (531040584600).

Almost surely, 2^{2121212112211} is an apocalyptic number.

2121212112211 is a deficient number, since it is larger than the sum of its proper divisors (2950226189).

2121212112211 is an equidigital number, since it uses as much as digits as its factorization.

2121212112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950226188.

The product of its digits is 64, while the sum is 19.

Adding to 2121212112211 its reverse (1122112121212), we get a palindrome (3243324233423).

Subtracting from 2121212112211 its reverse (1122112121212), we obtain a palindrome (999099990999).

The spelling of 2121212112211 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred eleven".