21325235 has 4 divisors (see below), whose sum is σ = 25590288. Its totient is φ = 17060184.

The previous prime is 21325219. The next prime is 21325279. The reversal of 21325235 is 53252312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21325235 - 2⁴ = 21325219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21325235.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2132519 + ... + 2132528.

It is an arithmetic number, because the mean of its divisors is an integer number (6397572).

Almost surely, 2^21325235 is an apocalyptic number.

21325235 is a deficient number, since it is larger than the sum of its proper divisors (4265053).

21325235 is an equidigital number, since it uses as much as digits as its factorization.

21325235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265052.

The product of its digits is 1800, while the sum is 23.

The square root of 21325235 is about 4617.9254000038. The cubic root of 21325235 is about 277.3094111066.

Adding to 21325235 its reverse (53252312), we get a palindrome (74577547).

The spelling of 21325235 in words is "twenty-one million, three hundred twenty-five thousand, two hundred thirty-five".