21480052544 has 56 divisors (see below), whose sum is σ = 44828325888. Its totient is φ = 10192089600.

The previous prime is 21480052541. The next prime is 21480052571. The reversal of 21480052544 is 44525008412.

It is a super-2 number, since 2×21480052544² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480052541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129494 + ... + 244394.

Almost surely, 2^21480052544 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 21480052544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22414162944).

21480052544 is an abundant number, since it is smaller than the sum of its proper divisors (23348273344).

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

21480052544 is a wasteful number, since it uses less digits than its factorization.

21480052544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115063 (or 115053 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 35.

The spelling of 21480052544 in words is "twenty-one billion, four hundred eighty million, fifty-two thousand, five hundred forty-four".