21317383432660 has 384 divisors, whose sum is σ = 53830443663360. Its totient is φ = 6939596353536.

The previous prime is 21317383432649. The next prime is 21317383432673. The reversal of 21317383432660 is 6623438371312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19326729669 + ... + 19326730771.

It is an arithmetic number, because the mean of its divisors is an integer number (140183447040).

Almost surely, 2^{21317383432660} is an apocalyptic number.

21317383432660 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 21317383432660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26915221831680).

21317383432660 is an abundant number, since it is smaller than the sum of its proper divisors (32513060230700).

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

21317383432660 is a wasteful number, since it uses less digits than its factorization.

21317383432660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 21317383432660 in words is "twenty-one trillion, three hundred seventeen billion, three hundred eighty-three million, four hundred thirty-two thousand, six hundred sixty".