27868749421 has 2 divisors, whose sum is σ = 27868749422. Its totient is φ = 27868749420.

The previous prime is 27868749407. The next prime is 27868749437. The reversal of 27868749421 is 12494786872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27055644196 + 813105225 = 164486^2 + 28515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27868749421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27868749481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13934374710 + 13934374711.

It is an arithmetic number, because the mean of its divisors is an integer number (13934374711).

Almost surely, 2^27868749421 is an apocalyptic number.

It is an amenable number.

27868749421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27868749421 is an equidigital number, since it uses as much as digits as its factorization.

27868749421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 58.

The spelling of 27868749421 in words is "twenty-seven billion, eight hundred sixty-eight million, seven hundred forty-nine thousand, four hundred twenty-one".