21202320 has 120 divisors (see below), whose sum is σ = 69120576. Its totient is φ = 5375744.

The previous prime is 21202283. The next prime is 21202367. The reversal of 21202320 is 2320212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21202296 and 21202305.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126877 + ... + 127043.

Almost surely, 2^21202320 is an apocalyptic number.

21202320 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 21202320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34560288).

21202320 is an abundant number, since it is smaller than the sum of its proper divisors (47918256).

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

21202320 is a wasteful number, since it uses less digits than its factorization.

21202320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21202320 is about 4604.5977022971. The cubic root of 21202320 is about 276.7755962091.

Adding to 21202320 its reverse (2320212), we get a palindrome (23522532).

The spelling of 21202320 in words is "twenty-one million, two hundred two thousand, three hundred twenty".