221311130231 has 4 divisors (see below), whose sum is σ = 221333656200. Its totient is φ = 221288604264.

The previous prime is 221311130213. The next prime is 221311130267. The reversal of 221311130231 is 132031113122.

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 221311130231 - 2¹⁸ = 221310868087 is a prime.

It is a super-2 number, since 2×221311130231² (a number of 23 digits) 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 (221311130281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11248241 + ... + 11267898.

It is an arithmetic number, because the mean of its divisors is an integer number (55333414050).

Almost surely, 2^221311130231 is an apocalyptic number.

221311130231 is a deficient number, since it is larger than the sum of its proper divisors (22525969).

221311130231 is an equidigital number, since it uses as much as digits as its factorization.

221311130231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22525968.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 221311130231 its reverse (132031113122), we get a palindrome (353342243353).

The spelling of 221311130231 in words is "two hundred twenty-one billion, three hundred eleven million, one hundred thirty thousand, two hundred thirty-one".