21593047081760 has 432 divisors, whose sum is σ = 65260610021880. Its totient is φ = 6726885580800.

The previous prime is 21593047081759. The next prime is 21593047081799. The reversal of 21593047081760 is 6718074039512.

It can be written as a sum of positive squares in 4 ways, for example, as 17153480088976 + 4439566992784 = 4141676^2 + 2107028^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2391516926 + ... + 2391525954.

It is a 1-persistent number, because it is pandigital, but 2⋅21593047081760 = 43186094163520 is not.

Almost surely, 2^{21593047081760} is an apocalyptic number.

21593047081760 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 21593047081760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32630305010940).

21593047081760 is an abundant number, since it is smaller than the sum of its proper divisors (43667562940120).

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

21593047081760 is a wasteful number, since it uses less digits than its factorization.

21593047081760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11601 (or 11575 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 21593047081760 in words is "twenty-one trillion, five hundred ninety-three billion, forty-seven million, eighty-one thousand, seven hundred sixty".