212120211222111 has 32 divisors (see below), whose sum is σ = 301066435872000. Its totient is φ = 132461511038208.

The previous prime is 212120211222097. The next prime is 212120211222209. The reversal of 212120211222111 is 111222112021212.

It is not a de Polignac number, because 212120211222111 - 2⁶ = 212120211222047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120211223111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178683141 + ... + 179866353.

It is an arithmetic number, because the mean of its divisors is an integer number (9408326121000).

Almost surely, 2^{212120211222111} is an apocalyptic number.

212120211222111 is a deficient number, since it is larger than the sum of its proper divisors (88946224649889).

212120211222111 is a wasteful number, since it uses less digits than its factorization.

212120211222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218663.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212120211222111 its reverse (111222112021212), we get a palindrome (323342323243323).

The spelling of 212120211222111 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-two thousand, one hundred eleven".