231221119 has 2 divisors, whose sum is σ = 231221120. Its totient is φ = 231221118.

The previous prime is 231221117. The next prime is 231221129. The reversal of 231221119 is 911122132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231221119 - 2¹ = 231221117 is a prime.

It is a super-2 number, since 2×231221119² = 106926411743224322, which contains 22 as substring.

Together with 231221117, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 231221119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610559 + 115610560.

It is an arithmetic number, because the mean of its divisors is an integer number (115610560).

Almost surely, 2^231221119 is an apocalyptic number.

231221119 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221119 is an equidigital number, since it uses as much as digits as its factorization.

231221119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 231221119 is about 15205.9566946641. The cubic root of 231221119 is about 613.7749593510.

The spelling of 231221119 in words is "two hundred thirty-one million, two hundred twenty-one thousand, one hundred nineteen".