21110242343 has 2 divisors, whose sum is σ = 21110242344. Its totient is φ = 21110242342.

The previous prime is 21110242291. The next prime is 21110242357. The reversal of 21110242343 is 34324201112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110242343 - 2³⁴ = 3930373159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110242393) 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, 10555121171 + 10555121172.

It is an arithmetic number, because the mean of its divisors is an integer number (10555121172).

Almost surely, 2^21110242343 is an apocalyptic number.

21110242343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110242343 is an equidigital number, since it uses as much as digits as its factorization.

21110242343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21110242343 its reverse (34324201112), we get a palindrome (55434443455).

The spelling of 21110242343 in words is "twenty-one billion, one hundred ten million, two hundred forty-two thousand, three hundred forty-three".