21541436224 has 112 divisors (see below), whose sum is σ = 53567015040. Its totient is φ = 8349788160.

The previous prime is 21541436221. The next prime is 21541436233. The reversal of 21541436224 is 42263414512.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 21541436224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541436221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 959722 + ... + 981910.

It is an arithmetic number, because the mean of its divisors is an integer number (478276920).

Almost surely, 2^21541436224 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 21541436224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26783507520).

21541436224 is an abundant number, since it is smaller than the sum of its proper divisors (32025578816).

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

21541436224 is a wasteful number, since it uses less digits than its factorization.

21541436224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22416 (or 22406 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The spelling of 21541436224 in words is "twenty-one billion, five hundred forty-one million, four hundred thirty-six thousand, two hundred twenty-four".