21366344366039 has 2 divisors, whose sum is σ = 21366344366040. Its totient is φ = 21366344366038.

The previous prime is 21366344366033. The next prime is 21366344366041. The reversal of 21366344366039 is 93066344366312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21366344366039 - 2¹⁶ = 21366344300503 is a prime.

Together with 21366344366041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21366344366033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683172183019 + 10683172183020.

It is an arithmetic number, because the mean of its divisors is an integer number (10683172183020).

Almost surely, 2^{21366344366039} is an apocalyptic number.

21366344366039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21366344366039 is an equidigital number, since it uses as much as digits as its factorization.

21366344366039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30233088, while the sum is 56.

The spelling of 21366344366039 in words is "twenty-one trillion, three hundred sixty-six billion, three hundred forty-four million, three hundred sixty-six thousand, thirty-nine".