21310430442320 has 160 divisors (see below), whose sum is σ = 50362255180800. Its totient is φ = 8384727416832.

The previous prime is 21310430442293. The next prime is 21310430442331. The reversal of 21310430442320 is 2324403401312.

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, 2706769904 + ... + 2706777776.

It is an arithmetic number, because the mean of its divisors is an integer number (314764094880).

Almost surely, 2^{21310430442320} is an apocalyptic number.

21310430442320 is a gapful number since it is divisible by the number (20) 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 21310430442320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25181127590400).

21310430442320 is an abundant number, since it is smaller than the sum of its proper divisors (29051824738480).

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

21310430442320 is a wasteful number, since it uses less digits than its factorization.

21310430442320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9517 (or 9511 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21310430442320 its reverse (2324403401312), we get a palindrome (23634833843632).

The spelling of 21310430442320 in words is "twenty-one trillion, three hundred ten billion, four hundred thirty million, four hundred forty-two thousand, three hundred twenty".