21352525204224 has 144 divisors (see below), whose sum is σ = 58247226543744. Its totient is φ = 6940057804800.

The previous prime is 21352525204223. The next prime is 21352525204243. The reversal of 21352525204224 is 42240252525312.

It is not an unprimeable number, because it can be changed into a prime (21352525204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56837547 + ... + 57211989.

It is an arithmetic number, because the mean of its divisors is an integer number (404494628776).

Almost surely, 2^{21352525204224} is an apocalyptic number.

21352525204224 is a gapful number since it is divisible by the number (24) 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 21352525204224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29123613271872).

21352525204224 is an abundant number, since it is smaller than the sum of its proper divisors (36894701339520).

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

21352525204224 is a wasteful number, since it uses less digits than its factorization.

21352525204224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376314 (or 376300 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 39.

Adding to 21352525204224 its reverse (42240252525312), we get a palindrome (63592777729536).

The spelling of 21352525204224 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred twenty-five million, two hundred four thousand, two hundred twenty-four".