21163325 has 12 divisors (see below), whose sum is σ = 26614368. Its totient is φ = 16690800.

The previous prime is 21163313. The next prime is 21163333. The reversal of 21163325 is 52336112.

It is not a de Polignac number, because 21163325 - 2⁴ = 21163309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21163325.

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, 4187 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (2217864).

Almost surely, 2^21163325 is an apocalyptic number.

21163325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21163325 is a deficient number, since it is larger than the sum of its proper divisors (5451043).

21163325 is a wasteful number, since it uses less digits than its factorization.

21163325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12004 (or 11999 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 21163325 is about 4600.3613988468. The cubic root of 21163325 is about 276.6058115214.

Adding to 21163325 its reverse (52336112), we get a palindrome (73499437).

It can be divided in two parts, 211 and 63325, that added together give a palindrome (63536).

The spelling of 21163325 in words is "twenty-one million, one hundred sixty-three thousand, three hundred twenty-five".