123111323012 has 6 divisors (see below), whose sum is σ = 215444815278. Its totient is φ = 61555661504.

The previous prime is 123111322979. The next prime is 123111323047. The reversal of 123111323012 is 210323111321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 84951263296 + 38160059716 = 291464^2 + 195346^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15388915373 + ... + 15388915380.

It is an arithmetic number, because the mean of its divisors is an integer number (35907469213).

Almost surely, 2^123111323012 is an apocalyptic number.

It is an amenable number.

123111323012 is a deficient number, since it is larger than the sum of its proper divisors (92333492266).

123111323012 is a wasteful number, since it uses less digits than its factorization.

123111323012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30777830757 (or 30777830755 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123111323012 its reverse (210323111321), we get a palindrome (333434434333).

The spelling of 123111323012 in words is "one hundred twenty-three billion, one hundred eleven million, three hundred twenty-three thousand, twelve".