21313325 has 48 divisors (see below), whose sum is σ = 31497984. Its totient is φ = 14131200.

The previous prime is 21313301. The next prime is 21313333. The reversal of 21313325 is 52331312.

It is not a de Polignac number, because 21313325 - 2¹⁶ = 21247789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313297 and 21313306.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 219677 + ... + 219773.

It is an arithmetic number, because the mean of its divisors is an integer number (656208).

Almost surely, 2^21313325 is an apocalyptic number.

21313325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21313325 is a deficient number, since it is larger than the sum of its proper divisors (10184659).

21313325 is a wasteful number, since it uses less digits than its factorization.

21313325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 177 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21313325 is about 4616.6356797997. The cubic root of 21313325 is about 277.2577763473.

Adding to 21313325 its reverse (52331312), we get a palindrome (73644637).

The spelling of 21313325 in words is "twenty-one million, three hundred thirteen thousand, three hundred twenty-five".