221411225 has 24 divisors (see below), whose sum is σ = 327419520. Its totient is φ = 145221120.

The previous prime is 221411221. The next prime is 221411227. The reversal of 221411225 is 522114122.

It is not a de Polignac number, because 221411225 - 2² = 221411221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221411197 and 221411206.

It is not an unprimeable number, because it can be changed into a prime (221411221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23480 + ... + 31529.

It is an arithmetic number, because the mean of its divisors is an integer number (13642480).

Almost surely, 2^221411225 is an apocalyptic number.

221411225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221411225 is a deficient number, since it is larger than the sum of its proper divisors (106008295).

221411225 is a wasteful number, since it uses less digits than its factorization.

221411225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55049 (or 55044 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 221411225 is about 14879.8933127896. The cubic root of 221411225 is about 604.9691262163.

Adding to 221411225 its reverse (522114122), we get a palindrome (743525347).

The spelling of 221411225 in words is "two hundred twenty-one million, four hundred eleven thousand, two hundred twenty-five".