221334225 has 72 divisors (see below), whose sum is σ = 429168960. Its totient is φ = 100356480.

The previous prime is 221334209. The next prime is 221334257. The reversal of 221334225 is 522433122.

It is not a de Polignac number, because 221334225 - 2⁴ = 221334209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221334195 and 221334204.

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 71 ways as a sum of consecutive naturals, for example, 841444 + ... + 841706.

It is an arithmetic number, because the mean of its divisors is an integer number (5960680).

Almost surely, 2^221334225 is an apocalyptic number.

221334225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221334225 is a deficient number, since it is larger than the sum of its proper divisors (207834735).

221334225 is a wasteful number, since it uses less digits than its factorization.

221334225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519 (or 507 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 221334225 is about 14877.3057036548. The cubic root of 221334225 is about 604.8989882129.

Adding to 221334225 its reverse (522433122), we get a palindrome (743767347).

The spelling of 221334225 in words is "two hundred twenty-one million, three hundred thirty-four thousand, two hundred twenty-five".