21314225 has 6 divisors (see below), whose sum is σ = 26429670. Its totient is φ = 17051360.

The previous prime is 21314221. The next prime is 21314231. The reversal of 21314225 is 52241312.

It can be written as a sum of positive squares in 3 ways, for example, as 43681 + 21270544 = 209^2 + 4612^2 .

It is not a de Polignac number, because 21314225 - 2² = 21314221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21314197 and 21314206.

It is not an unprimeable number, because it can be changed into a prime (21314221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426260 + ... + 426309.

It is an arithmetic number, because the mean of its divisors is an integer number (4404945).

Almost surely, 2^21314225 is an apocalyptic number.

21314225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21314225 is a deficient number, since it is larger than the sum of its proper divisors (5115445).

21314225 is an equidigital number, since it uses as much as digits as its factorization.

21314225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852579 (or 852574 counting only the distinct ones).

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

The square root of 21314225 is about 4616.7331523492. The cubic root of 21314225 is about 277.2616788900.

Adding to 21314225 its reverse (52241312), we get a palindrome (73555537).

The spelling of 21314225 in words is "twenty-one million, three hundred fourteen thousand, two hundred twenty-five".