221322025 has 6 divisors (see below), whose sum is σ = 274439342. Its totient is φ = 177057600.

The previous prime is 221322019. The next prime is 221322037. The reversal of 221322025 is 520223122.

It can be written as a sum of positive squares in 3 ways, for example, as 10810944 + 210511081 = 3288^2 + 14509^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221322025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221321993 and 221322011.

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, 4426416 + ... + 4426465.

Almost surely, 2^221322025 is an apocalyptic number.

221322025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221322025 is a deficient number, since it is larger than the sum of its proper divisors (53117317).

221322025 is an equidigital number, since it uses as much as digits as its factorization.

221322025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8852891 (or 8852886 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221322025 is about 14876.8956775263. The cubic root of 221322025 is about 604.8878739456.

Adding to 221322025 its reverse (520223122), we get a palindrome (741545147).

The spelling of 221322025 in words is "two hundred twenty-one million, three hundred twenty-two thousand, twenty-five".