13123111012 has 96 divisors (see below), whose sum is σ = 27222499584. Its totient is φ = 5474304000.

The previous prime is 13123110997. The next prime is 13123111021. The reversal of 13123111012 is 21011132131.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2731012 + ... + 2735812.

It is an arithmetic number, because the mean of its divisors is an integer number (283567704).

Almost surely, 2^13123111012 is an apocalyptic number.

It is an amenable number.

13123111012 is an abundant number, since it is smaller than the sum of its proper divisors (14099388572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13123111012 is a wasteful number, since it uses less digits than its factorization.

13123111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949 (or 4947 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13123111012 its reverse (21011132131), we get a palindrome (34134243143).

The spelling of 13123111012 in words is "thirteen billion, one hundred twenty-three million, one hundred eleven thousand, twelve".