21324130464 has 288 divisors, whose sum is σ = 73818319680. Its totient is φ = 5327659008.

The previous prime is 21324130439. The next prime is 21324130481. The reversal of 21324130464 is 46403142312.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1152712 + ... + 1171064.

It is an arithmetic number, because the mean of its divisors is an integer number (256313610).

Almost surely, 2^21324130464 is an apocalyptic number.

21324130464 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 21324130464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36909159840).

21324130464 is an abundant number, since it is smaller than the sum of its proper divisors (52494189216).

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

21324130464 is a wasteful number, since it uses less digits than its factorization.

21324130464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18412 (or 18397 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21324130464 its reverse (46403142312), we get a palindrome (67727272776).

The spelling of 21324130464 in words is "twenty-one billion, three hundred twenty-four million, one hundred thirty thousand, four hundred sixty-four".