212120121222111 has 16 divisors (see below), whose sum is σ = 284987069376768. Its totient is φ = 140333303136000.

The previous prime is 212120121222103. The next prime is 212120121222203. The reversal of 212120121222111 is 111222121021212.

212120121222111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212120121222111 - 2³ = 212120121222103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120121222011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98601030 + ... + 100729356.

It is an arithmetic number, because the mean of its divisors is an integer number (17811691836048).

Almost surely, 2^{212120121222111} is an apocalyptic number.

212120121222111 is a deficient number, since it is larger than the sum of its proper divisors (72866948154657).

212120121222111 is a wasteful number, since it uses less digits than its factorization.

212120121222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382062.

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

Adding to 212120121222111 its reverse (111222121021212), we get a palindrome (323342242243323).

The spelling of 212120121222111 in words is "two hundred twelve trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".