21356366027 has 2 divisors, whose sum is σ = 21356366028. Its totient is φ = 21356366026.

The previous prime is 21356365999. The next prime is 21356366039. The reversal of 21356366027 is 72066365312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21356366027 - 2⁶ = 21356365963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21356366047) 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, 10678183013 + 10678183014.

It is an arithmetic number, because the mean of its divisors is an integer number (10678183014).

Almost surely, 2^21356366027 is an apocalyptic number.

21356366027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356366027 is an equidigital number, since it uses as much as digits as its factorization.

21356366027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 41.

The spelling of 21356366027 in words is "twenty-one billion, three hundred fifty-six million, three hundred sixty-six thousand, twenty-seven".