212311220123 has 4 divisors (see below), whose sum is σ = 212312452968. Its totient is φ = 212309987280.

The previous prime is 212311220089. The next prime is 212311220159. The reversal of 212311220123 is 321022113212.

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 212311220123 - 2⁸ = 212311219867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212311220095 and 212311220104.

It is not an unprimeable number, because it can be changed into a prime (212311220623) 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 3 ways as a sum of consecutive naturals, for example, 305993 + ... + 719898.

It is an arithmetic number, because the mean of its divisors is an integer number (53078113242).

Almost surely, 2^212311220123 is an apocalyptic number.

212311220123 is a deficient number, since it is larger than the sum of its proper divisors (1232845).

212311220123 is a wasteful number, since it uses less digits than its factorization.

212311220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232844.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212311220123 its reverse (321022113212), we get a palindrome (533333333335).

The spelling of 212311220123 in words is "two hundred twelve billion, three hundred eleven million, two hundred twenty thousand, one hundred twenty-three".