21035726880 has 384 divisors, whose sum is σ = 80472268800. Its totient is φ = 4511821824.

The previous prime is 21035726851. The next prime is 21035726923. The reversal of 21035726880 is 8862753012.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 6957049 + ... + 6960071.

It is an arithmetic number, because the mean of its divisors is an integer number (209563200).

Almost surely, 2^21035726880 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).

21035726880 is an abundant number, since it is smaller than the sum of its proper divisors (59436541920).

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 sum of its prime factors is 3176 (or 3168 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21035726880 in words is "twenty-one billion, thirty-five million, seven hundred twenty-six thousand, eight hundred eighty".