221230311 has 16 divisors (see below), whose sum is σ = 300060288. Its totient is φ = 144965600.

The previous prime is 221230309. The next prime is 221230337. The reversal of 221230311 is 113032122.

It is a cyclic number.

It is not a de Polignac number, because 221230311 - 2¹ = 221230309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39421 + ... + 44681.

It is an arithmetic number, because the mean of its divisors is an integer number (18753768).

Almost surely, 2^221230311 is an apocalyptic number.

221230311 is a deficient number, since it is larger than the sum of its proper divisors (78829977).

221230311 is a wasteful number, since it uses less digits than its factorization.

221230311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221230311 is about 14873.8129274238. The cubic root of 221230311 is about 604.8043089061.

Adding to 221230311 its reverse (113032122), we get a palindrome (334262433).

It can be divided in two parts, 2212 and 30311, that added together give a palindrome (32523).

The spelling of 221230311 in words is "two hundred twenty-one million, two hundred thirty thousand, three hundred eleven".