21164021144768 has 56 divisors (see below), whose sum is σ = 42200845475712. Its totient is φ = 10530771369984.

The previous prime is 21164021144767. The next prime is 21164021144837. The reversal of 21164021144768 is 86744112046112.

It is not an unprimeable number, because it can be changed into a prime (21164021144767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39653696 + ... + 40183872.

It is an arithmetic number, because the mean of its divisors is an integer number (753586526352).

Almost surely, 2^{21164021144768} is an apocalyptic number.

It is an amenable number.

21164021144768 is a deficient number, since it is larger than the sum of its proper divisors (21036824330944).

21164021144768 is a wasteful number, since it uses less digits than its factorization.

21164021144768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533209 (or 533199 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 21164021144768 in words is "twenty-one trillion, one hundred sixty-four billion, twenty-one million, one hundred forty-four thousand, seven hundred sixty-eight".