12721401967049 has 4 divisors (see below), whose sum is σ = 12721418495940. Its totient is φ = 12721385438160.

The previous prime is 12721401967033. The next prime is 12721401967051. The reversal of 12721401967049 is 94076910412721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11295211897225 + 1426190069824 = 3360835^2 + 1194232^2 .

It is a cyclic number.

It is not a de Polignac number, because 12721401967049 - 2⁴ = 12721401967033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721401967009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7050542 + ... + 8669079.

It is an arithmetic number, because the mean of its divisors is an integer number (3180354623985).

Almost surely, 2^{12721401967049} is an apocalyptic number.

It is an amenable number.

12721401967049 is a deficient number, since it is larger than the sum of its proper divisors (16528891).

12721401967049 is an equidigital number, since it uses as much as digits as its factorization.

12721401967049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16528890.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 12721401967049 in words is "twelve trillion, seven hundred twenty-one billion, four hundred one million, nine hundred sixty-seven thousand, forty-nine".