21069442916243 has 2 divisors, whose sum is σ = 21069442916244. Its totient is φ = 21069442916242.

The previous prime is 21069442916239. The next prime is 21069442916251. The reversal of 21069442916243 is 34261924496012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21069442916243 - 2² = 21069442916239 is a prime.

It is not a weakly prime, because it can be changed into another prime (21069442916843) 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, 10534721458121 + 10534721458122.

It is an arithmetic number, because the mean of its divisors is an integer number (10534721458122).

Almost surely, 2^{21069442916243} is an apocalyptic number.

21069442916243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21069442916243 is an equidigital number, since it uses as much as digits as its factorization.

21069442916243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 53.

The spelling of 21069442916243 in words is "twenty-one trillion, sixty-nine billion, four hundred forty-two million, nine hundred sixteen thousand, two hundred forty-three".