21108325 has 12 divisors (see below), whose sum is σ = 29913760. Its totient is φ = 14474160.

The previous prime is 21108323. The next prime is 21108343. The reversal of 21108325 is 52380112.

It is not a de Polignac number, because 21108325 - 2¹ = 21108323 is a prime.

It is a super-2 number, since 2×21108325² = 891122768611250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21108296 and 21108305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21108323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60135 + ... + 60484.

Almost surely, 2^21108325 is an apocalyptic number.

21108325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21108325 is a deficient number, since it is larger than the sum of its proper divisors (8805435).

21108325 is a wasteful number, since it uses less digits than its factorization.

21108325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120636 (or 120631 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21108325 is about 4594.3797187433. The cubic root of 21108325 is about 276.3659859794.

Adding to 21108325 its reverse (52380112), we get a palindrome (73488437).

The spelling of 21108325 in words is "twenty-one million, one hundred eight thousand, three hundred twenty-five".