21003332 has 12 divisors (see below), whose sum is σ = 42006720. Its totient is φ = 9001416.

The previous prime is 21003331. The next prime is 21003343. The reversal of 21003332 is 23330012.

21003332 is an admirable number.

It is a super-2 number, since 2×21003332² = 882279910204448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21003331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375032 + ... + 375087.

It is an arithmetic number, because the mean of its divisors is an integer number (3500560).

Almost surely, 2^21003332 is an apocalyptic number.

It is an amenable number.

21003332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21003332 is a wasteful number, since it uses less digits than its factorization.

21003332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750130 (or 750128 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21003332 is about 4582.9392315413. The cubic root of 21003332 is about 275.9070085099.

Adding to 21003332 its reverse (23330012), we get a palindrome (44333344).

The spelling of 21003332 in words is "twenty-one million, three thousand, three hundred thirty-two".