21109689619548 has 24 divisors (see below), whose sum is σ = 49390154833152. Its totient is φ = 7017390008304.

The previous prime is 21109689619547. The next prime is 21109689619559. The reversal of 21109689619548 is 84591698690112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109689619547) 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 7 ways as a sum of consecutive naturals, for example, 2396645190 + ... + 2396653997.

It is an arithmetic number, because the mean of its divisors is an integer number (2057923118048).

Almost surely, 2^{21109689619548} is an apocalyptic number.

It is an amenable number.

21109689619548 is an abundant number, since it is smaller than the sum of its proper divisors (28280465213604).

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

21109689619548 is a wasteful number, since it uses less digits than its factorization.

21109689619548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793299561 (or 4793299559 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 69.

The spelling of 21109689619548 in words is "twenty-one trillion, one hundred nine billion, six hundred eighty-nine million, six hundred nineteen thousand, five hundred forty-eight".