21544355330352 has 120 divisors (see below), whose sum is σ = 61485297689088. Its totient is φ = 7039828224000.

The previous prime is 21544355330317. The next prime is 21544355330357. The reversal of 21544355330352 is 25303355344512.

21544355330352 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 43 + 553 + 3 + 0 + 3 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21544355330298 and 21544355330307.

It is not an unprimeable number, because it can be changed into a prime (21544355330357) 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, 7558152 + ... + 10010712.

Almost surely, 2^{21544355330352} 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 21544355330352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30742648844544).

21544355330352 is an abundant number, since it is smaller than the sum of its proper divisors (39940942358736).

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

21544355330352 is a wasteful number, since it uses less digits than its factorization.

21544355330352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453779 (or 2453770 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 45.

The spelling of 21544355330352 in words is "twenty-one trillion, five hundred forty-four billion, three hundred fifty-five million, three hundred thirty thousand, three hundred fifty-two".