21324125 has 16 divisors (see below), whose sum is σ = 27475968. Its totient is φ = 16506000.

The previous prime is 21324119. The next prime is 21324139. The reversal of 21324125 is 52142312.

It is not a de Polignac number, because 21324125 - 2⁴ = 21324109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21324097 and 21324106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1124 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (1717248).

Almost surely, 2^21324125 is an apocalyptic number.

21324125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21324125 is a deficient number, since it is larger than the sum of its proper divisors (6151843).

21324125 is an equidigital number, since it uses as much as digits as its factorization.

21324125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5549 (or 5539 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21324125 is about 4617.8052146014. The cubic root of 21324125 is about 277.3045996116.

Adding to 21324125 its reverse (52142312), we get a palindrome (73466437).

The spelling of 21324125 in words is "twenty-one million, three hundred twenty-four thousand, one hundred twenty-five".