12123031311 has 12 divisors (see below), whose sum is σ = 17519813688. Its totient is φ = 8077973904.

The previous prime is 12123031309. The next prime is 12123031351. The reversal of 12123031311 is 11313032121.

12123031311 is a `hidden beast` number, since 121 + 230 + 3 + 1 + 311 = 666.

It is not a de Polignac number, because 12123031311 - 2¹ = 12123031309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123031351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318220 + ... + 354273.

It is an arithmetic number, because the mean of its divisors is an integer number (1459984474).

Almost surely, 2^12123031311 is an apocalyptic number.

12123031311 is a deficient number, since it is larger than the sum of its proper divisors (5396782377).

12123031311 is a wasteful number, since it uses less digits than its factorization.

12123031311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674502 (or 674499 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 12123031311 its reverse (11313032121), we get a palindrome (23436063432).

The spelling of 12123031311 in words is "twelve billion, one hundred twenty-three million, thirty-one thousand, three hundred eleven".