21324325 has 12 divisors (see below), whose sum is σ = 28846368. Its totient is φ = 15508400.

The previous prime is 21324313. The next prime is 21324361. The reversal of 21324325 is 52342312.

It is not a de Polignac number, because 21324325 - 2¹¹ = 21322277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21324296 and 21324305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38497 + ... + 39046.

It is an arithmetic number, because the mean of its divisors is an integer number (2403864).

Almost surely, 2^21324325 is an apocalyptic number.

21324325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21324325 is a deficient number, since it is larger than the sum of its proper divisors (7522043).

21324325 is a wasteful number, since it uses less digits than its factorization.

21324325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77564 (or 77559 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21324325 is about 4617.8268698599. The cubic root of 21324325 is about 277.3054665600.

Adding to 21324325 its reverse (52342312), we get a palindrome (73666637).

The spelling of 21324325 in words is "twenty-one million, three hundred twenty-four thousand, three hundred twenty-five".