221325025 has 6 divisors (see below), whose sum is σ = 274443062. Its totient is φ = 177060000.

The previous prime is 221324993. The next prime is 221325043. The reversal of 221325025 is 520523122.

It can be written as a sum of positive squares in 3 ways, for example, as 21752896 + 199572129 = 4664^2 + 14127^2 .

It is not a de Polignac number, because 221325025 - 2⁵ = 221324993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221324987 and 221325005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4426476 + ... + 4426525.

Almost surely, 2^221325025 is an apocalyptic number.

221325025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221325025 is a deficient number, since it is larger than the sum of its proper divisors (53118037).

221325025 is an equidigital number, since it uses as much as digits as its factorization.

221325025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8853011 (or 8853006 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 221325025 is about 14876.9965046712. The cubic root of 221325025 is about 604.8906070000.

Adding to 221325025 its reverse (520523122), we get a palindrome (741848147).

The spelling of 221325025 in words is "two hundred twenty-one million, three hundred twenty-five thousand, twenty-five".