21707552225500 has 96 divisors (see below), whose sum is σ = 49479842176128. Its totient is φ = 8303941184000.

The previous prime is 21707552225453. The next prime is 21707552225507. The reversal of 21707552225500 is 552225570712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707552225507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62121270 + ... + 62469730.

It is an arithmetic number, because the mean of its divisors is an integer number (515415022668).

Almost surely, 2^{21707552225500} is an apocalyptic number.

21707552225500 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 21707552225500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24739921088064).

21707552225500 is an abundant number, since it is smaller than the sum of its proper divisors (27772289950628).

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

21707552225500 is a wasteful number, since it uses less digits than its factorization.

21707552225500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353920 (or 353908 counting only the distinct ones).

The product of its (nonzero) digits is 490000, while the sum is 43.

The spelling of 21707552225500 in words is "twenty-one trillion, seven hundred seven billion, five hundred fifty-two million, two hundred twenty-five thousand, five hundred".