21030230231 has 2 divisors, whose sum is σ = 21030230232. Its totient is φ = 21030230230.

The previous prime is 21030230197. The next prime is 21030230233. The reversal of 21030230231 is 13203203012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030230231 - 2¹⁸ = 21029968087 is a prime.

It is a super-2 number, since 2×21030230231² (a number of 21 digits) contains 22 as substring.

Together with 21030230233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030230233) 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 as a sum of consecutive naturals, namely, 10515115115 + 10515115116.

It is an arithmetic number, because the mean of its divisors is an integer number (10515115116).

Almost surely, 2^21030230231 is an apocalyptic number.

21030230231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030230231 is an equidigital number, since it uses as much as digits as its factorization.

21030230231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21030230231 its reverse (13203203012), we get a palindrome (34233433243).

The spelling of 21030230231 in words is "twenty-one billion, thirty million, two hundred thirty thousand, two hundred thirty-one".