21330120 has 128 divisors (see below), whose sum is σ = 74419200. Its totient is φ = 4790016.

The previous prime is 21330119. The next prime is 21330149. The reversal of 21330120 is 2103312.

21330120 = T₃₅ + T₃₆ + ... + T₅₀₃.

It is a happy number.

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 = 21330096 and 21330105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56091 + ... + 56469.

It is an arithmetic number, because the mean of its divisors is an integer number (581400).

Almost surely, 2^21330120 is an apocalyptic number.

21330120 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 21330120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37209600).

21330120 is an abundant number, since it is smaller than the sum of its proper divisors (53089080).

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

21330120 is a wasteful number, since it uses less digits than its factorization.

21330120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21330120 is about 4618.4542868800. The cubic root of 21330120 is about 277.3305840355.

Adding to 21330120 its reverse (2103312), we get a palindrome (23433432).

The spelling of 21330120 in words is "twenty-one million, three hundred thirty thousand, one hundred twenty".