21143634112 has 56 divisors (see below), whose sum is σ = 44602694640. Its totient is φ = 9916185600.

The previous prime is 21143634089. The next prime is 21143634121.

21143634112 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36738 + ... + 208894.

It is an arithmetic number, because the mean of its divisors is an integer number (796476690).

Almost surely, 2^21143634112 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 21143634112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22301347320).

21143634112 is an abundant number, since it is smaller than the sum of its proper divisors (23459060528).

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

21143634112 is a wasteful number, since it uses less digits than its factorization.

21143634112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172289 (or 172279 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The spelling of 21143634112 in words is "twenty-one billion, one hundred forty-three million, six hundred thirty-four thousand, one hundred twelve".