211312013123 has 16 divisors (see below), whose sum is σ = 224085574656. Its totient is φ = 198576873600.

The previous prime is 211312013117. The next prime is 211312013131. The reversal of 211312013123 is 321310213112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211312013123 - 2³² = 207017045827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211312013095 and 211312013104.

It is not an unprimeable number, because it can be changed into a prime (211312013183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45431348 + ... + 45435998.

It is an arithmetic number, because the mean of its divisors is an integer number (14005348416).

Almost surely, 2^211312013123 is an apocalyptic number.

211312013123 is a deficient number, since it is larger than the sum of its proper divisors (12773561533).

211312013123 is a wasteful number, since it uses less digits than its factorization.

211312013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8194.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 211312013123 its reverse (321310213112), we get a palindrome (532622226235).

The spelling of 211312013123 in words is "two hundred eleven billion, three hundred twelve million, thirteen thousand, one hundred twenty-three".