21576918048 has 144 divisors (see below), whose sum is σ = 65816936640. Its totient is φ = 6063068160.

The previous prime is 21576917983. The next prime is 21576918151. The reversal of 21576918048 is 84081967512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2496198 + ... + 2504826.

It is an arithmetic number, because the mean of its divisors is an integer number (457062060).

Almost surely, 2^21576918048 is an apocalyptic number.

21576918048 is a gapful number since it is divisible by the number (28) 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 21576918048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32908468320).

21576918048 is an abundant number, since it is smaller than the sum of its proper divisors (44240018592).

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

21576918048 is an equidigital number, since it uses as much as digits as its factorization.

21576918048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771 (or 8702 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 21576918048 in words is "twenty-one billion, five hundred seventy-six million, nine hundred eighteen thousand, forty-eight".