211223123123 has 4 divisors (see below), whose sum is σ = 218036772288. Its totient is φ = 204409473960.

The previous prime is 211223123117. The next prime is 211223123129. The reversal of 211223123123 is 321321322112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (211223123117) and next prime (211223123129).

It is a cyclic number.

It is not a de Polignac number, because 211223123123 - 2¹² = 211223119027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211223123129) 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, 3406824536 + ... + 3406824597.

It is an arithmetic number, because the mean of its divisors is an integer number (54509193072).

Almost surely, 2^211223123123 is an apocalyptic number.

211223123123 is a deficient number, since it is larger than the sum of its proper divisors (6813649165).

211223123123 is an equidigital number, since it uses as much as digits as its factorization.

211223123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813649164.

The product of its digits is 864, while the sum is 23.

Adding to 211223123123 its reverse (321321322112), we get a palindrome (532544445235).

The spelling of 211223123123 in words is "two hundred eleven billion, two hundred twenty-three million, one hundred twenty-three thousand, one hundred twenty-three".