21310224320 has 224 divisors, whose sum is σ = 63900320256. Its totient is φ = 6575616000.

The previous prime is 21310224317. The next prime is 21310224343. The reversal of 21310224320 is 2342201312.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21310224292 and 21310224301.

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, 2484359 + ... + 2492921.

Almost surely, 2^21310224320 is an apocalyptic number.

21310224320 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 21310224320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31950160128).

21310224320 is an abundant number, since it is smaller than the sum of its proper divisors (42590095936).

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

21310224320 is a wasteful number, since it uses less digits than its factorization.

21310224320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8699 (or 8689 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21310224320 its reverse (2342201312), we get a palindrome (23652425632).

The spelling of 21310224320 in words is "twenty-one billion, three hundred ten million, two hundred twenty-four thousand, three hundred twenty".