212101111222111 has 4 divisors (see below), whose sum is σ = 212392859656432. Its totient is φ = 211809362787792.

The previous prime is 212101111222103. The next prime is 212101111222127. The reversal of 212101111222111 is 111222111101212.

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 212101111222111 - 2³ = 212101111222103 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 (212101111222141) 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, 145874216070 + ... + 145874217523.

It is an arithmetic number, because the mean of its divisors is an integer number (53098214914108).

Almost surely, 2^{212101111222111} is an apocalyptic number.

212101111222111 is a deficient number, since it is larger than the sum of its proper divisors (291748434321).

212101111222111 is an equidigital number, since it uses as much as digits as its factorization.

212101111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291748434320.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 212101111222111 its reverse (111222111101212), we get a palindrome (323323222323323).

The spelling of 212101111222111 in words is "two hundred twelve trillion, one hundred one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".