21230203320 has 192 divisors, whose sum is σ = 70298223840. Its totient is φ = 5555174400.

The previous prime is 21230203301. The next prime is 21230203331. The reversal of 21230203320 is 2330203212.

It is a happy number.

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 = 21230203293 and 21230203302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11879467 + ... + 11881253.

Almost surely, 2^21230203320 is an apocalyptic number.

21230203320 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 21230203320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35149111920).

21230203320 is an abundant number, since it is smaller than the sum of its proper divisors (49068020520).

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

21230203320 is a wasteful number, since it uses less digits than its factorization.

21230203320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21230203320 its reverse (2330203212), we get a palindrome (23560406532).

The spelling of 21230203320 in words is "twenty-one billion, two hundred thirty million, two hundred three thousand, three hundred twenty".