21230322320 has 80 divisors (see below), whose sum is σ = 51331000320. Its totient is φ = 8156198400.

The previous prime is 21230322301. The next prime is 21230322343. The reversal of 21230322320 is 2322303212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21230322320² (a number of 21 digits) contains 22 as substring.

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 = 21230322292 and 21230322301.

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, 419165 + ... + 467075.

It is an arithmetic number, because the mean of its divisors is an integer number (641637504).

Almost surely, 2^21230322320 is an apocalyptic number.

21230322320 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 21230322320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25665500160).

21230322320 is an abundant number, since it is smaller than the sum of its proper divisors (30100678000).

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

21230322320 is a wasteful number, since it uses less digits than its factorization.

21230322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48144 (or 48138 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21230322320 its reverse (2322303212), we get a palindrome (23552625532).

The spelling of 21230322320 in words is "twenty-one billion, two hundred thirty million, three hundred twenty-two thousand, three hundred twenty".