11721356861072 has 20 divisors (see below), whose sum is σ = 23138621918460. Its totient is φ = 5750099591808.

The previous prime is 11721356861059. The next prime is 11721356861077. The reversal of 11721356861072 is 27016865312711.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9281625323776 + 2439731537296 = 3046576^2 + 1561964^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11721356861072.

It is not an unprimeable number, because it can be changed into a prime (11721356861077) 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, 6911176547 + ... + 6911178242.

It is an arithmetic number, because the mean of its divisors is an integer number (1156931095923).

Almost surely, 2^{11721356861072} is an apocalyptic number.

It is an amenable number.

11721356861072 is a deficient number, since it is larger than the sum of its proper divisors (11417265057388).

11721356861072 is a wasteful number, since it uses less digits than its factorization.

11721356861072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13822354850 (or 13822354844 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 11721356861072 in words is "eleven trillion, seven hundred twenty-one billion, three hundred fifty-six million, eight hundred sixty-one thousand, seventy-two".