221323245 has 48 divisors (see below), whose sum is σ = 418364352. Its totient is φ = 99041280.

The previous prime is 221323237. The next prime is 221323253. The reversal of 221323245 is 542323122.

It is an interprime number because it is at equal distance from previous prime (221323237) and next prime (221323253).

It is not a de Polignac number, because 221323245 - 2³ = 221323237 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 23917 + ... + 31853.

It is an arithmetic number, because the mean of its divisors is an integer number (8715924).

Almost surely, 2^221323245 is an apocalyptic number.

It is an amenable number.

221323245 is a deficient number, since it is larger than the sum of its proper divisors (197041107).

221323245 is a wasteful number, since it uses less digits than its factorization.

221323245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7982 (or 7969 counting only the distinct ones).

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

The square root of 221323245 is about 14876.9366806477. The cubic root of 221323245 is about 604.8889853907. Note that the first 3 decimals are identical.

Adding to 221323245 its reverse (542323122), we get a palindrome (763646367).

The spelling of 221323245 in words is "two hundred twenty-one million, three hundred twenty-three thousand, two hundred forty-five".