21230203333231 has 2 divisors, whose sum is σ = 21230203333232. Its totient is φ = 21230203333230.

The previous prime is 21230203333201. The next prime is 21230203333267. The reversal of 21230203333231 is 13233330203212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230203333231 - 2¹³ = 21230203325039 is a prime.

It is a super-2 number, since 2×21230203333231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21230203333231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230203333201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615101666615 + 10615101666616.

It is an arithmetic number, because the mean of its divisors is an integer number (10615101666616).

Almost surely, 2^{21230203333231} is an apocalyptic number.

21230203333231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230203333231 is an equidigital number, since it uses as much as digits as its factorization.

21230203333231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 28.

Adding to 21230203333231 its reverse (13233330203212), we get a palindrome (34463533536443).

The spelling of 21230203333231 in words is "twenty-one trillion, two hundred thirty billion, two hundred three million, three hundred thirty-three thousand, two hundred thirty-one".