221300231 has 4 divisors (see below), whose sum is σ = 226446792. Its totient is φ = 216153672.

The previous prime is 221300221. The next prime is 221300243. The reversal of 221300231 is 132003122.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221300231 is a prime.

It is a super-2 number, since 2×221300231² = 97947584481306722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221300221) 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, 2573216 + ... + 2573301.

It is an arithmetic number, because the mean of its divisors is an integer number (56611698).

Almost surely, 2^221300231 is an apocalyptic number.

221300231 is a deficient number, since it is larger than the sum of its proper divisors (5146561).

221300231 is an equidigital number, since it uses as much as digits as its factorization.

221300231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146560.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221300231 is about 14876.1631814121. The cubic root of 221300231 is about 604.8680184747.

Adding to 221300231 its reverse (132003122), we get a palindrome (353303353).

The spelling of 221300231 in words is "two hundred twenty-one million, three hundred thousand, two hundred thirty-one".