123311231211 has 24 divisors (see below), whose sum is σ = 191985513984. Its totient is φ = 70195616400.

The previous prime is 123311231203. The next prime is 123311231213. The reversal of 123311231211 is 112132113321.

It is not a de Polignac number, because 123311231211 - 2³ = 123311231203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (123311231213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1556115 + ... + 1633436.

It is an arithmetic number, because the mean of its divisors is an integer number (7999396416).

Almost surely, 2^123311231211 is an apocalyptic number.

123311231211 is a deficient number, since it is larger than the sum of its proper divisors (68674282773).

123311231211 is a wasteful number, since it uses less digits than its factorization.

123311231211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189831 (or 3189824 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

Adding to 123311231211 its reverse (112132113321), we get a palindrome (235443344532).

The spelling of 123311231211 in words is "one hundred twenty-three billion, three hundred eleven million, two hundred thirty-one thousand, two hundred eleven".