212123300111 has 4 divisors (see below), whose sum is σ = 224601141312. Its totient is φ = 199645458912.

The previous prime is 212123300083. The next prime is 212123300141. The reversal of 212123300111 is 111003321212.

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 212123300111 - 2¹⁴ = 212123283727 is a prime.

It is a super-2 number, since 2×212123300111² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12477841183 = 212123300111 / (2 + 1 + 2 + 1 + 2 + 3 + 3 + 0 + 0 + 1 + 1 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212123300111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212123300141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6238920575 + ... + 6238920608.

It is an arithmetic number, because the mean of its divisors is an integer number (56150285328).

Almost surely, 2^212123300111 is an apocalyptic number.

212123300111 is a deficient number, since it is larger than the sum of its proper divisors (12477841201).

212123300111 is a wasteful number, since it uses less digits than its factorization.

212123300111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12477841200.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 212123300111 its reverse (111003321212), we get a palindrome (323126621323).

The spelling of 212123300111 in words is "two hundred twelve billion, one hundred twenty-three million, three hundred thousand, one hundred eleven".