21033360 has 120 divisors (see below), whose sum is σ = 71495424. Its totient is φ = 5541120.

The previous prime is 21033347. The next prime is 21033367. The reversal of 21033360 is 6333012.

It is a happy number.

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 (18).

It is not an unprimeable number, because it can be changed into a prime (21033367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94209 + ... + 94431.

Almost surely, 2^21033360 is an apocalyptic number.

21033360 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 21033360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35747712).

21033360 is an abundant number, since it is smaller than the sum of its proper divisors (50462064).

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

21033360 is a wasteful number, since it uses less digits than its factorization.

21033360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 21033360 is about 4586.2141249619. The cubic root of 21033360 is about 276.0384319513.

Adding to 21033360 its reverse (6333012), we get a palindrome (27366372).

The spelling of 21033360 in words is "twenty-one million, thirty-three thousand, three hundred sixty".