27949821899 has 2 divisors, whose sum is σ = 27949821900. Its totient is φ = 27949821898.

The previous prime is 27949821857. The next prime is 27949821917. The reversal of 27949821899 is 99812894972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27949821899 - 2¹² = 27949817803 is a prime.

It is not a weakly prime, because it can be changed into another prime (27949821829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13974910949 + 13974910950.

It is an arithmetic number, because the mean of its divisors is an integer number (13974910950).

Almost surely, 2^27949821899 is an apocalyptic number.

27949821899 is a deficient number, since it is larger than the sum of its proper divisors (1).

27949821899 is an equidigital number, since it uses as much as digits as its factorization.

27949821899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 68.

The spelling of 27949821899 in words is "twenty-seven billion, nine hundred forty-nine million, eight hundred twenty-one thousand, eight hundred ninety-nine".