211223231123 has 4 divisors (see below), whose sum is σ = 213197280120. Its totient is φ = 209249182128.

The previous prime is 211223231111. The next prime is 211223231137. The reversal of 211223231123 is 321132322112.

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 211223231123 - 2³⁶ = 142503754387 is a prime.

It is a super-3 number, since 3×211223231123³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211223221123) 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, 987024338 + ... + 987024551.

It is an arithmetic number, because the mean of its divisors is an integer number (53299320030).

Almost surely, 2^211223231123 is an apocalyptic number.

211223231123 is a deficient number, since it is larger than the sum of its proper divisors (1974048997).

211223231123 is a wasteful number, since it uses less digits than its factorization.

211223231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974048996.

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

Adding to 211223231123 its reverse (321132322112), we get a palindrome (532355553235).

The spelling of 211223231123 in words is "two hundred eleven billion, two hundred twenty-three million, two hundred thirty-one thousand, one hundred twenty-three".