21310213320 has 256 divisors, whose sum is σ = 82050796800. Its totient is φ = 4862177280.

The previous prime is 21310213313. The next prime is 21310213321. The reversal of 21310213320 is 2331201312.

21310213320 is a `hidden beast` number, since 2 + 1 + 310 + 21 + 332 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21310213293 and 21310213302.

It is not an unprimeable number, because it can be changed into a prime (21310213321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149202 + ... + 254718.

It is an arithmetic number, because the mean of its divisors is an integer number (320510925).

Almost surely, 2^21310213320 is an apocalyptic number.

21310213320 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 21310213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41025398400).

21310213320 is an abundant number, since it is smaller than the sum of its proper divisors (60740583480).

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

21310213320 is a wasteful number, since it uses less digits than its factorization.

21310213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105565 (or 105555 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21310213320 its reverse (2331201312), we get a palindrome (23641414632).

The spelling of 21310213320 in words is "twenty-one billion, three hundred ten million, two hundred thirteen thousand, three hundred twenty".