21103325 has 24 divisors (see below), whose sum is σ = 27269088. Its totient is φ = 16188480.

The previous prime is 21103321. The next prime is 21103337. The reversal of 21103325 is 52330112.

It is not a de Polignac number, because 21103325 - 2² = 21103321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71879 + ... + 72171.

It is an arithmetic number, because the mean of its divisors is an integer number (1136212).

Almost surely, 2^21103325 is an apocalyptic number.

21103325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21103325 is a deficient number, since it is larger than the sum of its proper divisors (6165763).

21103325 is a wasteful number, since it uses less digits than its factorization.

21103325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21103325 is about 4593.8355434212. The cubic root of 21103325 is about 276.3441630091.

Adding to 21103325 its reverse (52330112), we get a palindrome (73433437).

The spelling of 21103325 in words is "twenty-one million, one hundred three thousand, three hundred twenty-five".