16221750121012 has 72 divisors (see below), whose sum is σ = 30107630405160. Its totient is φ = 7638374365440.

The previous prime is 16221750121009. The next prime is 16221750121043. The reversal of 16221750121012 is 21012105712261.

16221750121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4910460993936 + 11311289127076 = 2215956^2 + 3363226^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74971462 + ... + 75187522.

It is an arithmetic number, because the mean of its divisors is an integer number (418161533405).

Almost surely, 2^{16221750121012} is an apocalyptic number.

It is an amenable number.

16221750121012 is a deficient number, since it is larger than the sum of its proper divisors (13885880284148).

16221750121012 is a wasteful number, since it uses less digits than its factorization.

16221750121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216481 (or 216432 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 16221750121012 its reverse (21012105712261), we get a palindrome (37233855833273).

The spelling of 16221750121012 in words is "sixteen trillion, two hundred twenty-one billion, seven hundred fifty million, one hundred twenty-one thousand, twelve".