221885425 has 6 divisors (see below), whose sum is σ = 275137958. Its totient is φ = 177508320.

The previous prime is 221885407. The next prime is 221885429. The reversal of 221885425 is 524588122.

It can be written as a sum of positive squares in 3 ways, for example, as 34715664 + 187169761 = 5892^2 + 13681^2 .

It is not a de Polignac number, because 221885425 - 2⁷ = 221885297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221885429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4437684 + ... + 4437733.

Almost surely, 2^221885425 is an apocalyptic number.

221885425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221885425 is a deficient number, since it is larger than the sum of its proper divisors (53252533).

221885425 is an equidigital number, since it uses as much as digits as its factorization.

221885425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8875427 (or 8875422 counting only the distinct ones).

The product of its digits is 51200, while the sum is 37.

The square root of 221885425 is about 14895.8190442822. The cubic root of 221885425 is about 605.4007089728.

The spelling of 221885425 in words is "two hundred twenty-one million, eight hundred eighty-five thousand, four hundred twenty-five".