21384727520318 has 16 divisors (see below), whose sum is σ = 34264545194880. Its totient is φ = 9974344536576.

The previous prime is 21384727520239. The next prime is 21384727520353. The reversal of 21384727520318 is 81302572748312.

It is a super-2 number, since 2×21384727520318² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21384727520318.

It is a congruent number.

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, 2783016398 + ... + 2783024081.

It is an arithmetic number, because the mean of its divisors is an integer number (2141534074680).

Almost surely, 2^{21384727520318} is an apocalyptic number.

21384727520318 is a deficient number, since it is larger than the sum of its proper divisors (12879817674562).

21384727520318 is a wasteful number, since it uses less digits than its factorization.

21384727520318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566040611.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 21384727520318 in words is "twenty-one trillion, three hundred eighty-four billion, seven hundred twenty-seven million, five hundred twenty thousand, three hundred eighteen".