21580573081000 has 512 divisors, whose sum is σ = 53211968409600. Its totient is φ = 8185328640000.

The previous prime is 21580573080977. The next prime is 21580573081027. The reversal of 21580573081000 is 18037508512.

It is a super-2 number, since 2×21580573081000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 79633110865 + ... + 79633111135.

It is an arithmetic number, because the mean of its divisors is an integer number (103929625800).

Almost surely, 2^{21580573081000} is an apocalyptic number.

21580573081000 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 21580573081000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26605984204800).

21580573081000 is an abundant number, since it is smaller than the sum of its proper divisors (31631395328600).

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

21580573081000 is a wasteful number, since it uses less digits than its factorization.

21580573081000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 21580573081000 in words is "twenty-one trillion, five hundred eighty billion, five hundred seventy-three million, eighty-one thousand".