11721221505711 has 24 divisors (see below), whose sum is σ = 18179061043104. Its totient is φ = 7250907525120.

The previous prime is 11721221505701. The next prime is 11721221505737. The reversal of 11721221505711 is 11750512212711.

11721221505711 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 12 + 21 + 50 + 571 + 1 = 666.

It is not a de Polignac number, because 11721221505711 - 2²⁵ = 11721187951279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721221505701) 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 23 ways as a sum of consecutive naturals, for example, 539491186 + ... + 539512911.

It is an arithmetic number, because the mean of its divisors is an integer number (757460876796).

Almost surely, 2^{11721221505711} is an apocalyptic number.

11721221505711 is a deficient number, since it is larger than the sum of its proper divisors (6457839537393).

11721221505711 is a wasteful number, since it uses less digits than its factorization.

11721221505711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079004191 (or 1079004188 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 36.

The spelling of 11721221505711 in words is "eleven trillion, seven hundred twenty-one billion, two hundred twenty-one million, five hundred five thousand, seven hundred eleven".