21605652260000 has 120 divisors (see below), whose sum is σ = 53266986732960. Its totient is φ = 8623751264000.

The previous prime is 21605652259987. The next prime is 21605652260189. The reversal of 21605652260000 is 6225650612.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8183381 + ... + 10496619.

It is an arithmetic number, because the mean of its divisors is an integer number (443891556108).

Almost surely, 2^{21605652260000} is an apocalyptic number.

21605652260000 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 21605652260000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26633493366480).

21605652260000 is an abundant number, since it is smaller than the sum of its proper divisors (31661334472960).

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

21605652260000 is an equidigital number, since it uses as much as digits as its factorization.

21605652260000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313736 (or 2313713 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21605652260000 in words is "twenty-one trillion, six hundred five billion, six hundred fifty-two million, two hundred sixty thousand".