21303412 has 24 divisors (see below), whose sum is σ = 40346600. Its totient is φ = 9783936.

The previous prime is 21303409. The next prime is 21303421. The reversal of 21303412 is 21430312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9511056 + 11792356 = 3084^2 + 3434^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11014 + ... + 12802.

Almost surely, 2^21303412 is an apocalyptic number.

It is an amenable number.

21303412 is a deficient number, since it is larger than the sum of its proper divisors (19043188).

21303412 is a wasteful number, since it uses less digits than its factorization.

21303412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035 (or 2033 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21303412 is about 4615.5619376193. The cubic root of 21303412 is about 277.2147847359.

Adding to 21303412 its reverse (21430312), we get a palindrome (42733724).

The spelling of 21303412 in words is "twenty-one million, three hundred three thousand, four hundred twelve".