21234433124249 has 2 divisors, whose sum is σ = 21234433124250. Its totient is φ = 21234433124248.

The previous prime is 21234433124237. The next prime is 21234433124251. The reversal of 21234433124249 is 94242133443212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20504549958025 + 729883166224 = 4528195^2 + 854332^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234433124249 - 2⁸ = 21234433123993 is a prime.

It is a Sophie Germain prime.

Together with 21234433124251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21234433114249) 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, 10617216562124 + 10617216562125.

It is an arithmetic number, because the mean of its divisors is an integer number (10617216562125).

Almost surely, 2^{21234433124249} is an apocalyptic number.

It is an amenable number.

21234433124249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234433124249 is an equidigital number, since it uses as much as digits as its factorization.

21234433124249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 44.

The spelling of 21234433124249 in words is "twenty-one trillion, two hundred thirty-four billion, four hundred thirty-three million, one hundred twenty-four thousand, two hundred forty-nine".