21352738284660 has 192 divisors, whose sum is σ = 62477676108288. Its totient is φ = 5438596939776.

The previous prime is 21352738284617. The next prime is 21352738284679. The reversal of 21352738284660 is 6648283725312.

It is a self number, because there is not a number n which added to its sum of digits gives 21352738284660.

It is a congruent number.

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, 4997128284 + ... + 4997132556.

It is an arithmetic number, because the mean of its divisors is an integer number (325404563064).

Almost surely, 2^{21352738284660} is an apocalyptic number.

21352738284660 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 21352738284660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31238838054144).

21352738284660 is an abundant number, since it is smaller than the sum of its proper divisors (41124937823628).

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

21352738284660 is a wasteful number, since it uses less digits than its factorization.

21352738284660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8714 (or 8712 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 21352738284660 in words is "twenty-one trillion, three hundred fifty-two billion, seven hundred thirty-eight million, two hundred eighty-four thousand, six hundred sixty".