21009163027 has 2 divisors, whose sum is σ = 21009163028. Its totient is φ = 21009163026.

The previous prime is 21009163003. The next prime is 21009163081. The reversal of 21009163027 is 72036190012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21009163027 - 2²³ = 21000774419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21009163027.

It is not a weakly prime, because it can be changed into another prime (21009163727) 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, 10504581513 + 10504581514.

It is an arithmetic number, because the mean of its divisors is an integer number (10504581514).

Almost surely, 2^21009163027 is an apocalyptic number.

21009163027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21009163027 is an equidigital number, since it uses as much as digits as its factorization.

21009163027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 21009163027 in words is "twenty-one billion, nine million, one hundred sixty-three thousand, twenty-seven".