21780113165168 has 40 divisors (see below), whose sum is σ = 42237304045776. Its totient is φ = 10880164889600.

The previous prime is 21780113165141. The next prime is 21780113165189. The reversal of 21780113165168 is 86156131108712.

It is a congruent number.

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, 473756423 + ... + 473802393.

Almost surely, 2^{21780113165168} is an apocalyptic number.

It is an amenable number.

21780113165168 is a deficient number, since it is larger than the sum of its proper divisors (20457190880608).

21780113165168 is a wasteful number, since it uses less digits than its factorization.

21780113165168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72233 (or 72227 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 21780113165168 in words is "twenty-one trillion, seven hundred eighty billion, one hundred thirteen million, one hundred sixty-five thousand, one hundred sixty-eight".