212221211122211 has 4 divisors (see below), whose sum is σ = 212311633455672. Its totient is φ = 212130788788752.

The previous prime is 212221211122111. The next prime is 212221211122223. The reversal of 212221211122211 is 112221112122212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221211122211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221211122241) 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, 45211163210 + ... + 45211167903.

It is an arithmetic number, because the mean of its divisors is an integer number (53077908363918).

Almost surely, 2^{212221211122211} is an apocalyptic number.

212221211122211 is a deficient number, since it is larger than the sum of its proper divisors (90422333461).

212221211122211 is an equidigital number, since it uses as much as digits as its factorization.

212221211122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90422333460.

The product of its digits is 256, while the sum is 23.

Adding to 212221211122211 its reverse (112221112122212), we get a palindrome (324442323244423).

The spelling of 212221211122211 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred eleven".