121312123112 has 8 divisors (see below), whose sum is σ = 227460230850. Its totient is φ = 60656061552.

The previous prime is 121312123091. The next prime is 121312123129. The reversal of 121312123112 is 211321213121.

It can be written as a sum of positive squares in only one way, i.e., 104837373796 + 16474749316 = 323786^2 + 128354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7582007687 + ... + 7582007702.

Almost surely, 2^121312123112 is an apocalyptic number.

It is an amenable number.

121312123112 is a deficient number, since it is larger than the sum of its proper divisors (106148107738).

121312123112 is a wasteful number, since it uses less digits than its factorization.

121312123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15164015395 (or 15164015391 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 121312123112 its reverse (211321213121), we get a palindrome (332633336233).

Subtracting 121312123112 from its reverse (211321213121), we obtain a palindrome (90009090009).

The spelling of 121312123112 in words is "one hundred twenty-one billion, three hundred twelve million, one hundred twenty-three thousand, one hundred twelve".