21488084064 has 144 divisors (see below), whose sum is σ = 63292713120. Its totient is φ = 6907084800.

The previous prime is 21488084063. The next prime is 21488084069. The reversal of 21488084064 is 46048088412.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488084063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13370749 + ... + 13372355.

It is an arithmetic number, because the mean of its divisors is an integer number (439532730).

Almost surely, 2^21488084064 is an apocalyptic number.

21488084064 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 21488084064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31646356560).

21488084064 is an abundant number, since it is smaller than the sum of its proper divisors (41804629056).

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

21488084064 is a wasteful number, since it uses less digits than its factorization.

21488084064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253 (or 3242 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 45.

The spelling of 21488084064 in words is "twenty-one billion, four hundred eighty-eight million, eighty-four thousand, sixty-four".