21134134112 has 144 divisors (see below), whose sum is σ = 54202901760. Its totient is φ = 7920446976.

The previous prime is 21134134097. The next prime is 21134134123. The reversal of 21134134112 is 21143143112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 704573 + ... + 733955.

It is an arithmetic number, because the mean of its divisors is an integer number (376409040).

Almost surely, 2^21134134112 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 21134134112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27101450880).

21134134112 is an abundant number, since it is smaller than the sum of its proper divisors (33068767648).

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

21134134112 is a wasteful number, since it uses less digits than its factorization.

21134134112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29445 (or 29424 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 21134134112 its reverse (21143143112), we get a palindrome (42277277224).

The spelling of 21134134112 in words is "twenty-one billion, one hundred thirty-four million, one hundred thirty-four thousand, one hundred twelve".