221225263 has 4 divisors (see below), whose sum is σ = 252828880. Its totient is φ = 189621648.

The previous prime is 221225209. The next prime is 221225309. The reversal of 221225263 is 362522122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221225263 - 2²¹ = 219128111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221225203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15801798 + ... + 15801811.

It is an arithmetic number, because the mean of its divisors is an integer number (63207220).

Almost surely, 2^221225263 is an apocalyptic number.

221225263 is a deficient number, since it is larger than the sum of its proper divisors (31603617).

221225263 is an equidigital number, since it uses as much as digits as its factorization.

221225263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31603616.

The product of its digits is 2880, while the sum is 25.

The square root of 221225263 is about 14873.6432322414. The cubic root of 221225263 is about 604.7997087598.

Adding to 221225263 its reverse (362522122), we get a palindrome (583747385).

The spelling of 221225263 in words is "two hundred twenty-one million, two hundred twenty-five thousand, two hundred sixty-three".