21066183834 has 16 divisors (see below), whose sum is σ = 42155201088. Its totient is φ = 7018255712.

The previous prime is 21066183833. The next prime is 21066183863. The reversal of 21066183834 is 43838166012.

21066183834 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21066183833) 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, 939387 + ... + 961550.

It is an arithmetic number, because the mean of its divisors is an integer number (2634700068).

Almost surely, 2^21066183834 is an apocalyptic number.

21066183834 is an abundant number, since it is smaller than the sum of its proper divisors (21089017254).

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

21066183834 is a wasteful number, since it uses less digits than its factorization.

21066183834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902789.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 21066183834 in words is "twenty-one billion, sixty-six million, one hundred eighty-three thousand, eight hundred thirty-four".