21033625 has 8 divisors (see below), whose sum is σ = 26250120. Its totient is φ = 16826800.

The previous prime is 21033601. The next prime is 21033631. The reversal of 21033625 is 52633012.

It can be written as a sum of positive squares in 4 ways, for example, as 458329 + 20575296 = 677^2 + 4536^2 .

It is not a de Polignac number, because 21033625 - 2¹⁹ = 20509337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033596 and 21033605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84010 + ... + 84259.

It is an arithmetic number, because the mean of its divisors is an integer number (3281265).

Almost surely, 2^21033625 is an apocalyptic number.

21033625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21033625 is a deficient number, since it is larger than the sum of its proper divisors (5216495).

21033625 is an equidigital number, since it uses as much as digits as its factorization.

21033625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168284 (or 168274 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21033625 is about 4586.2430158028. The cubic root of 21033625 is about 276.0395912189.

Adding to 21033625 its reverse (52633012), we get a palindrome (73666637).

The spelling of 21033625 in words is "twenty-one million, thirty-three thousand, six hundred twenty-five".