21104125 has 32 divisors (see below), whose sum is σ = 30551040. Its totient is φ = 14256000.

The previous prime is 21104071. The next prime is 21104131. The reversal of 21104125 is 52140112.

It is not a de Polignac number, because 21104125 - 2¹⁹ = 20579837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21104099 and 21104108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77740 + ... + 78010.

It is an arithmetic number, because the mean of its divisors is an integer number (954720).

Almost surely, 2^21104125 is an apocalyptic number.

21104125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21104125 is a deficient number, since it is larger than the sum of its proper divisors (9446915).

21104125 is an equidigital number, since it uses as much as digits as its factorization.

21104125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21104125 is about 4593.9226158045. The cubic root of 21104125 is about 276.3476549160.

Adding to 21104125 its reverse (52140112), we get a palindrome (73244237).

The spelling of 21104125 in words is "twenty-one million, one hundred four thousand, one hundred twenty-five".