221301231 has 16 divisors (see below), whose sum is σ = 303733248. Its totient is φ = 143236800.

The previous prime is 221301209. The next prime is 221301251. The reversal of 221301231 is 132103122.

It is not a de Polignac number, because 221301231 - 2⁶ = 221301167 is a prime.

It is a super-2 number, since 2×221301231² = 97948469684230722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221301231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221301251) 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, 21690 + ... + 30216.

It is an arithmetic number, because the mean of its divisors is an integer number (18983328).

Almost surely, 2^221301231 is an apocalyptic number.

221301231 is a deficient number, since it is larger than the sum of its proper divisors (82432017).

221301231 is a wasteful number, since it uses less digits than its factorization.

221301231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8782.

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

The square root of 221301231 is about 14876.1967921912. The cubic root of 221301231 is about 604.8689295554.

Adding to 221301231 its reverse (132103122), we get a palindrome (353404353).

The spelling of 221301231 in words is "two hundred twenty-one million, three hundred one thousand, two hundred thirty-one".