21564493482 has 64 divisors (see below), whose sum is σ = 50944204800. Its totient is φ = 5955042240.

The previous prime is 21564493477. The next prime is 21564493519. The reversal of 21564493482 is 28439446512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1069369 + ... + 1089347.

It is an arithmetic number, because the mean of its divisors is an integer number (796003200).

Almost surely, 2^21564493482 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21564493482, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25472102400).

21564493482 is an abundant number, since it is smaller than the sum of its proper divisors (29379711318).

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

21564493482 is a wasteful number, since it uses less digits than its factorization.

21564493482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20851.

The product of its digits is 1658880, while the sum is 48.

The spelling of 21564493482 in words is "twenty-one billion, five hundred sixty-four million, four hundred ninety-three thousand, four hundred eighty-two".