212021113123 has 16 divisors (see below), whose sum is σ = 217764771840. Its totient is φ = 206315204256.

The previous prime is 212021113079. The next prime is 212021113163. The reversal of 212021113123 is 321311120212.

212021113123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021113123 is a prime.

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 212021113123.

It is not an unprimeable number, because it can be changed into a prime (212021113163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30516336 + ... + 30523282.

It is an arithmetic number, because the mean of its divisors is an integer number (13610298240).

Almost surely, 2^212021113123 is an apocalyptic number.

212021113123 is a deficient number, since it is larger than the sum of its proper divisors (5743658717).

212021113123 is a wasteful number, since it uses less digits than its factorization.

212021113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 212021113123 its reverse (321311120212), we get a palindrome (533332233335).

The spelling of 212021113123 in words is "two hundred twelve billion, twenty-one million, one hundred thirteen thousand, one hundred twenty-three".