21030332 has 6 divisors (see below), whose sum is σ = 36803088. Its totient is φ = 10515164.

The previous prime is 21030329. The next prime is 21030337. The reversal of 21030332 is 23303012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628788 + ... + 2628795.

It is an arithmetic number, because the mean of its divisors is an integer number (6133848).

Almost surely, 2^21030332 is an apocalyptic number.

It is an amenable number.

21030332 is a deficient number, since it is larger than the sum of its proper divisors (15772756).

21030332 is a wasteful number, since it uses less digits than its factorization.

21030332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257587 (or 5257585 counting only the distinct ones).

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

The square root of 21030332 is about 4585.8839932994. The cubic root of 21030332 is about 276.0251849874.

Adding to 21030332 its reverse (23303012), we get a palindrome (44333344).

The spelling of 21030332 in words is "twenty-one million, thirty thousand, three hundred thirty-two".