21089699456 has 32 divisors (see below), whose sum is σ = 48016728480. Its totient is φ = 9038442240.

The previous prime is 21089699441. The next prime is 21089699467. The reversal of 21089699456 is 65499698012.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 21089699395 and 21089699404.

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 3 ways as a sum of consecutive naturals, for example, 11767910 + ... + 11769701.

It is an arithmetic number, because the mean of its divisors is an integer number (1500522765).

Almost surely, 2^21089699456 is an apocalyptic number.

It is an amenable number.

21089699456 is an abundant number, since it is smaller than the sum of its proper divisors (26927029024).

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

21089699456 is an equidigital number, since it uses as much as digits as its factorization.

21089699456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23537632 (or 23537620 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 21089699456 in words is "twenty-one billion, eighty-nine million, six hundred ninety-nine thousand, four hundred fifty-six".