12643124721 has 8 divisors (see below), whose sum is σ = 16858128480. Its totient is φ = 8428435392.

The previous prime is 12643124717. The next prime is 12643124729. The reversal of 12643124721 is 12742134621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12643124721 - 2² = 12643124717 is a prime.

It is a super-2 number, since 2×12643124721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12643124729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41385 + ... + 164313.

It is an arithmetic number, because the mean of its divisors is an integer number (2107266060).

Almost surely, 2^12643124721 is an apocalyptic number.

It is an amenable number.

12643124721 is a deficient number, since it is larger than the sum of its proper divisors (4215003759).

12643124721 is a wasteful number, since it uses less digits than its factorization.

12643124721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157215.

The product of its digits is 16128, while the sum is 33.

The spelling of 12643124721 in words is "twelve billion, six hundred forty-three million, one hundred twenty-four thousand, seven hundred twenty-one".