It is an unprimeable number.
Almost surely, 221035726880 is an apocalyptic number.
21035726880 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 21035726880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40236134400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21035726880 is a wasteful number, since it uses less digits than its factorization.
21035726880 is an evil number, because the sum of its binary digits is even.
The spelling of 21035726880 in words is "twenty-one billion, thirty-five million, seven hundred twenty-six thousand, eight hundred eighty".