21068873280 has 896 divisors, whose sum is σ = 92635791360. Its totient is φ = 4389396480.

The previous prime is 21068873251. The next prime is 21068873297. The reversal of 21068873280 is 8237886012.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 99852375 + ... + 99852585.

It is an arithmetic number, because the mean of its divisors is an integer number (103388160).

Almost surely, 2^21068873280 is an apocalyptic number.

21068873280 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 21068873280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46317895680).

21068873280 is an abundant number, since it is smaller than the sum of its proper divisors (71566918080).

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

21068873280 is a wasteful number, since it uses less digits than its factorization.

21068873280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 21068873280 in words is "twenty-one billion, sixty-eight million, eight hundred seventy-three thousand, two hundred eighty".