21303325 has 12 divisors (see below), whose sum is σ = 26653428. Its totient is φ = 16889600.

The previous prime is 21303319. The next prime is 21303341. The reversal of 21303325 is 52330312.

It can be written as a sum of positive squares in 6 ways, for example, as 8608356 + 12694969 = 2934^2 + 3563^2 .

It is not a de Polignac number, because 21303325 - 2¹¹ = 21301277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 946 + ... + 6595.

It is an arithmetic number, because the mean of its divisors is an integer number (2221119).

Almost surely, 2^21303325 is an apocalyptic number.

21303325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303325 is a deficient number, since it is larger than the sum of its proper divisors (5350103).

21303325 is a wasteful number, since it uses less digits than its factorization.

21303325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7664 (or 7659 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 21303325 is about 4615.5525129718. The cubic root of 21303325 is about 277.2144073672.

Adding to 21303325 its reverse (52330312), we get a palindrome (73633637).

The spelling of 21303325 in words is "twenty-one million, three hundred three thousand, three hundred twenty-five".