212121122012111 has 6 divisors (see below), whose sum is σ = 229693285965960. Its totient is φ = 195804112626408.

The previous prime is 212121122012089. The next prime is 212121122012113. The reversal of 212121122012111 is 111210221121212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-212121122012111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121122012113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 627577283891 + ... + 627577284228.

It is an arithmetic number, because the mean of its divisors is an integer number (38282214327660).

Almost surely, 2^{212121122012111} is an apocalyptic number.

212121122012111 is a deficient number, since it is larger than the sum of its proper divisors (17572163953849).

212121122012111 is a wasteful number, since it uses less digits than its factorization.

212121122012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255154568145 (or 1255154568132 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212121122012111 its reverse (111210221121212), we get a palindrome (323331343133323).

The spelling of 212121122012111 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, twelve thousand, one hundred eleven".