11721700521170 has 16 divisors (see below), whose sum is σ = 21099100207680. Its totient is φ = 4688671481904.

The previous prime is 11721700521169. The next prime is 11721700521187. The reversal of 11721700521170 is 7112500712711.

It is a self number, because there is not a number n which added to its sum of digits gives 11721700521170.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8965061 + ... + 10188999.

It is an arithmetic number, because the mean of its divisors is an integer number (1318693762980).

Almost surely, 2^{11721700521170} is an apocalyptic number.

11721700521170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721700521170 is a deficient number, since it is larger than the sum of its proper divisors (9377399686510).

11721700521170 is a wasteful number, since it uses less digits than its factorization.

11721700521170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181649.

The product of its (nonzero) digits is 6860, while the sum is 35.

The spelling of 11721700521170 in words is "eleven trillion, seven hundred twenty-one billion, seven hundred million, five hundred twenty-one thousand, one hundred seventy".