21504522112000 has 176 divisors, whose sum is σ = 53711808452640. Its totient is φ = 8591751168000.

The previous prime is 21504522111923. The next prime is 21504522112001. The reversal of 21504522112000 is 21122540512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21504522112001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109854210 + ... + 110049790.

Almost surely, 2^{21504522112000} is an apocalyptic number.

21504522112000 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 21504522112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26855904226320).

21504522112000 is an abundant number, since it is smaller than the sum of its proper divisors (32207286340640).

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

21504522112000 is an equidigital number, since it uses as much as digits as its factorization.

21504522112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196475 (or 196447 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21504522112000 its reverse (21122540512), we get a palindrome (21525644652512).

The spelling of 21504522112000 in words is "twenty-one trillion, five hundred four billion, five hundred twenty-two million, one hundred twelve thousand".