221113304231 has 2 divisors, whose sum is σ = 221113304232. Its totient is φ = 221113304230.

The previous prime is 221113304219. The next prime is 221113304233. The reversal of 221113304231 is 132403311122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221113304231 is a prime.

It is a super-2 number, since 2×221113304231² (a number of 23 digits) contains 22 as substring.

Together with 221113304233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221113304197 and 221113304206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221113304233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556652115 + 110556652116.

It is an arithmetic number, because the mean of its divisors is an integer number (110556652116).

Almost surely, 2^221113304231 is an apocalyptic number.

221113304231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221113304231 is an equidigital number, since it uses as much as digits as its factorization.

221113304231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 221113304231 its reverse (132403311122), we get a palindrome (353516615353).

The spelling of 221113304231 in words is "two hundred twenty-one billion, one hundred thirteen million, three hundred four thousand, two hundred thirty-one".