21544124000 has 144 divisors (see below), whose sum is σ = 61576744320. Its totient is φ = 7386489600.

The previous prime is 21544123973. The next prime is 21544124009. The reversal of 21544124000 is 42144512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544124009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141041 + ... + 250959.

It is an arithmetic number, because the mean of its divisors is an integer number (427616280).

Almost surely, 2^21544124000 is an apocalyptic number.

21544124000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21544124000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30788372160).

21544124000 is an abundant number, since it is smaller than the sum of its proper divisors (40032620320).

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

21544124000 is a wasteful number, since it uses less digits than its factorization.

21544124000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109958 (or 109933 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21544124000 its reverse (42144512), we get a palindrome (21586268512).

The spelling of 21544124000 in words is "twenty-one billion, five hundred forty-four million, one hundred twenty-four thousand".