21325117 has 16 divisors (see below), whose sum is σ = 25067520. Its totient is φ = 17938800.

The previous prime is 21325099. The next prime is 21325147. The reversal of 21325117 is 71152312.

It is a happy number.

It is not a de Polignac number, because 21325117 - 2¹¹ = 21323069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325147) 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 15 ways as a sum of consecutive naturals, for example, 6484 + ... + 9202.

It is an arithmetic number, because the mean of its divisors is an integer number (1566720).

Almost surely, 2^21325117 is an apocalyptic number.

It is an amenable number.

21325117 is a deficient number, since it is larger than the sum of its proper divisors (3742403).

21325117 is a wasteful number, since it uses less digits than its factorization.

21325117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784.

The product of its digits is 420, while the sum is 22.

The square root of 21325117 is about 4617.9126236862. The cubic root of 21325117 is about 277.3088996223.

Adding to 21325117 its reverse (71152312), we get a palindrome (92477429).

The spelling of 21325117 in words is "twenty-one million, three hundred twenty-five thousand, one hundred seventeen".