21144234233 has 2 divisors, whose sum is σ = 21144234234. Its totient is φ = 21144234232.

The previous prime is 21144234197. The next prime is 21144234239. The reversal of 21144234233 is 33243244112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13598358544 + 7545875689 = 116612^2 + 86867^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144234233 - 2¹⁶ = 21144168697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21144234196 and 21144234205.

It is not a weakly prime, because it can be changed into another prime (21144234239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572117116 + 10572117117.

It is an arithmetic number, because the mean of its divisors is an integer number (10572117117).

Almost surely, 2^21144234233 is an apocalyptic number.

It is an amenable number.

21144234233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144234233 is an equidigital number, since it uses as much as digits as its factorization.

21144234233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 29.

Adding to 21144234233 its reverse (33243244112), we get a palindrome (54387478345).

The spelling of 21144234233 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, two hundred thirty-three".