21067625 has 8 divisors (see below), whose sum is σ = 26292552. Its totient is φ = 16854000.

The previous prime is 21067621. The next prime is 21067639. The reversal of 21067625 is 52676012.

It can be written as a sum of positive squares in 4 ways, for example, as 346921 + 20720704 = 589^2 + 4552^2 .

It is not a de Polignac number, because 21067625 - 2² = 21067621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21067621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84146 + ... + 84395.

It is an arithmetic number, because the mean of its divisors is an integer number (3286569).

Almost surely, 2^21067625 is an apocalyptic number.

21067625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21067625 is a deficient number, since it is larger than the sum of its proper divisors (5224927).

21067625 is an equidigital number, since it uses as much as digits as its factorization.

21067625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168556 (or 168546 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21067625 is about 4589.9482567890. The cubic root of 21067625 is about 276.1882467428.

The spelling of 21067625 in words is "twenty-one million, sixty-seven thousand, six hundred twenty-five".