21326843382210 has 128 divisors (see below), whose sum is σ = 58852591200000. Its totient is φ = 5489190153216.

The previous prime is 21326843382209. The next prime is 21326843382253. The reversal of 21326843382210 is 1228334862312.

21326843382210 is a `hidden beast` number, since 2 + 1 + 3 + 26 + 84 + 338 + 2 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22740666 + ... + 23659914.

It is an arithmetic number, because the mean of its divisors is an integer number (459785868750).

Almost surely, 2^{21326843382210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21326843382210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29426295600000).

21326843382210 is an abundant number, since it is smaller than the sum of its proper divisors (37525747817790).

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

21326843382210 is a wasteful number, since it uses less digits than its factorization.

21326843382210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922257 (or 922251 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 21326843382210 in words is "twenty-one trillion, three hundred twenty-six billion, eight hundred forty-three million, three hundred eighty-two thousand, two hundred ten".