21138330018336 has 48 divisors (see below), whose sum is σ = 55730422540800. Its totient is φ = 7015340959488.

The previous prime is 21138330018293. The next prime is 21138330018341. The reversal of 21138330018336 is 63381003383112.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480744256 + ... + 480788223.

It is an arithmetic number, because the mean of its divisors is an integer number (1161050469600).

Almost surely, 2^{21138330018336} is an apocalyptic number.

It is an amenable number.

21138330018336 is an abundant number, since it is smaller than the sum of its proper divisors (34592092522464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21138330018336 is a wasteful number, since it uses less digits than its factorization.

21138330018336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961532721 (or 961532713 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 21138330018336 in words is "twenty-one trillion, one hundred thirty-eight billion, three hundred thirty million, eighteen thousand, three hundred thirty-six".