21204134054112 has 96 divisors (see below), whose sum is σ = 56066779843200. Its totient is φ = 7016508246528.

The previous prime is 21204134054071. The next prime is 21204134054143. The reversal of 21204134054112 is 21145043140212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 21204134054112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146538214 + ... + 146682842.

It is an arithmetic number, because the mean of its divisors is an integer number (584028956700).

Almost surely, 2^{21204134054112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204134054112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28033389921600).

21204134054112 is an abundant number, since it is smaller than the sum of its proper divisors (34862645789088).

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

21204134054112 is a wasteful number, since it uses less digits than its factorization.

21204134054112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155768 (or 155760 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21204134054112 its reverse (21145043140212), we get a palindrome (42349177194324).

The spelling of 21204134054112 in words is "twenty-one trillion, two hundred four billion, one hundred thirty-four million, fifty-four thousand, one hundred twelve".