12123641512 has 8 divisors (see below), whose sum is σ = 22731827850. Its totient is φ = 6061820752.

The previous prime is 12123641507. The next prime is 12123641531. The reversal of 12123641512 is 21514632121.

It can be written as a sum of positive squares in only one way, i.e., 10368534276 + 1755107236 = 101826^2 + 41894^2 .

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

It is a super-2 number, since 2×12123641512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757727587 + ... + 757727602.

Almost surely, 2^12123641512 is an apocalyptic number.

It is an amenable number.

12123641512 is a deficient number, since it is larger than the sum of its proper divisors (10608186338).

12123641512 is a wasteful number, since it uses less digits than its factorization.

12123641512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515455195 (or 1515455191 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The spelling of 12123641512 in words is "twelve billion, one hundred twenty-three million, six hundred forty-one thousand, five hundred twelve".