21544469260 has 144 divisors (see below), whose sum is σ = 48112390368. Its totient is φ = 8099553280.

The previous prime is 21544469237. The next prime is 21544469269. The reversal of 21544469260 is 6296444512.

It is not an unprimeable number, because it can be changed into a prime (21544469269) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 190658964 + ... + 190659076.

It is an arithmetic number, because the mean of its divisors is an integer number (334113822).

Almost surely, 2^21544469260 is an apocalyptic number.

21544469260 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 21544469260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24056195184).

21544469260 is an abundant number, since it is smaller than the sum of its proper divisors (26567921108).

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

21544469260 is a wasteful number, since it uses less digits than its factorization.

21544469260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 21544469260 in words is "twenty-one billion, five hundred forty-four million, four hundred sixty-nine thousand, two hundred sixty".