21303130524 has 96 divisors (see below), whose sum is σ = 57189914880. Its totient is φ = 6117078528.

The previous prime is 21303130501. The next prime is 21303130549. The reversal of 21303130524 is 42503130312.

It is a junction number, because it is equal to n+sod(n) for n = 21303130494 and 21303130503.

It is a congruent number.

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, 144952 + ... + 252224.

It is an arithmetic number, because the mean of its divisors is an integer number (595728280).

Almost surely, 2^21303130524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21303130524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28594957440).

21303130524 is an abundant number, since it is smaller than the sum of its proper divisors (35886784356).

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

21303130524 is a wasteful number, since it uses less digits than its factorization.

21303130524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107379 (or 107377 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21303130524 its reverse (42503130312), we get a palindrome (63806260836).

The spelling of 21303130524 in words is "twenty-one billion, three hundred three million, one hundred thirty thousand, five hundred twenty-four".