12721667878001 has 4 divisors (see below), whose sum is σ = 12741452743152. Its totient is φ = 12701883012852.

The previous prime is 12721667877983. The next prime is 12721667878063. The reversal of 12721667878001 is 10087876612721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12721667878001 - 2⁶ = 12721667877937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721667878501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9892431611 + ... + 9892432896.

It is an arithmetic number, because the mean of its divisors is an integer number (3185363185788).

Almost surely, 2^{12721667878001} is an apocalyptic number.

It is an amenable number.

12721667878001 is a deficient number, since it is larger than the sum of its proper divisors (19784865151).

12721667878001 is an equidigital number, since it uses as much as digits as its factorization.

12721667878001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19784865150.

The product of its (nonzero) digits is 3161088, while the sum is 56.

The spelling of 12721667878001 in words is "twelve trillion, seven hundred twenty-one billion, six hundred sixty-seven million, eight hundred seventy-eight thousand, one".