21134888855910 has 128 divisors (see below), whose sum is σ = 59711860454400. Its totient is φ = 5301164459520.

The previous prime is 21134888855863. The next prime is 21134888855917. The reversal of 21134888855910 is 1955888843112.

21134888855910 is a `hidden beast` number, since 2 + 1 + 1 + 34 + 8 + 8 + 8 + 8 + 5 + 591 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134888855917) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 6009175 + ... + 8853245.

It is an arithmetic number, because the mean of its divisors is an integer number (466498909800).

Almost surely, 2^{21134888855910} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134888855910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29855930227200).

21134888855910 is an abundant number, since it is smaller than the sum of its proper divisors (38576971598490).

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

21134888855910 is a wasteful number, since it uses less digits than its factorization.

21134888855910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2845723 (or 2845717 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 63.

The spelling of 21134888855910 in words is "twenty-one trillion, one hundred thirty-four billion, eight hundred eighty-eight million, eight hundred fifty-five thousand, nine hundred ten".