21489380055360 has 504 divisors, whose sum is σ = 86206902552576. Its totient is φ = 4899021281280.

The previous prime is 21489380055337. The next prime is 21489380055373. The reversal of 21489380055360 is 6355008398412.

21489380055360 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 9 + 3 + 80 + 0 + 553 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a junction number, because it is equal to n+sod(n) for n = 21489380055297 and 21489380055306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 53850165 + ... + 54247755.

Almost surely, 2^{21489380055360} is an apocalyptic number.

21489380055360 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 21489380055360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43103451276288).

21489380055360 is an abundant number, since it is smaller than the sum of its proper divisors (64717522497216).

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

21489380055360 is a wasteful number, since it uses less digits than its factorization.

21489380055360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398011 (or 397991 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 21489380055360 in words is "twenty-one trillion, four hundred eighty-nine billion, three hundred eighty million, fifty-five thousand, three hundred sixty".