21130324320 has 96 divisors (see below), whose sum is σ = 76069179648. Its totient is φ = 4829787648.

The previous prime is 21130324297. The next prime is 21130324333. The reversal of 21130324320 is 2342303112.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3141034 + ... + 3147753.

It is an arithmetic number, because the mean of its divisors is an integer number (792387288).

Almost surely, 2^21130324320 is an apocalyptic number.

21130324320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130324320 is an abundant number, since it is smaller than the sum of its proper divisors (54938855328).

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

21130324320 is a wasteful number, since it uses less digits than its factorization.

21130324320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6288812 (or 6288804 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21130324320 its reverse (2342303112), we get a palindrome (23472627432).

The spelling of 21130324320 in words is "twenty-one billion, one hundred thirty million, three hundred twenty-four thousand, three hundred twenty".