21089704000 has 112 divisors (see below), whose sum is σ = 53640990000. Its totient is φ = 8207769600.

The previous prime is 21089703953. The next prime is 21089704057. The reversal of 21089704000 is 40798012.

It can be written as a sum of positive squares in 8 ways, for example, as 233722944 + 20855981056 = 15288^2 + 144416^2 .

It is a super-2 number, since 2×21089704000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260376 + ... + 331624.

Almost surely, 2^21089704000 is an apocalyptic number.

21089704000 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 21089704000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26820495000).

21089704000 is an abundant number, since it is smaller than the sum of its proper divisors (32551286000).

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

21089704000 is an equidigital number, since it uses as much as digits as its factorization.

21089704000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71313 (or 71293 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21089704000 in words is "twenty-one billion, eighty-nine million, seven hundred four thousand".