21483564864 has 112 divisors (see below), whose sum is σ = 57358824576. Its totient is φ = 7096320000.

The previous prime is 21483564847. The next prime is 21483564877. The reversal of 21483564864 is 46846538412.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 17887464 + ... + 17888664.

Almost surely, 2^21483564864 is an apocalyptic number.

21483564864 is a gapful number since it is divisible by the number (24) 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 21483564864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28679412288).

21483564864 is an abundant number, since it is smaller than the sum of its proper divisors (35875259712).

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

21483564864 is a wasteful number, since it uses less digits than its factorization.

21483564864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1974 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 51.

The spelling of 21483564864 in words is "twenty-one billion, four hundred eighty-three million, five hundred sixty-four thousand, eight hundred sixty-four".