27312121009 has 2 divisors, whose sum is σ = 27312121010. Its totient is φ = 27312121008.

The previous prime is 27312120971. The next prime is 27312121049. The reversal of 27312121009 is 90012121372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24994661409 + 2317459600 = 158097^2 + 48140^2 .

It is a cyclic number.

It is not a de Polignac number, because 27312121009 - 2⁷ = 27312120881 is a prime.

It is not a weakly prime, because it can be changed into another prime (27312121049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13656060504 + 13656060505.

It is an arithmetic number, because the mean of its divisors is an integer number (13656060505).

Almost surely, 2^27312121009 is an apocalyptic number.

It is an amenable number.

27312121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

27312121009 is an equidigital number, since it uses as much as digits as its factorization.

27312121009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 27312121009 in words is "twenty-seven billion, three hundred twelve million, one hundred twenty-one thousand, nine".