27247000021 has 2 divisors, whose sum is σ = 27247000022. Its totient is φ = 27247000020.

The previous prime is 27247000013. The next prime is 27247000051. The reversal of 27247000021 is 12000074272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26694984996 + 552015025 = 163386^2 + 23495^2 .

It is a cyclic number.

It is not a de Polignac number, because 27247000021 - 2³ = 27247000013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27247000021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27247000051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13623500010 + 13623500011.

It is an arithmetic number, because the mean of its divisors is an integer number (13623500011).

Almost surely, 2^27247000021 is an apocalyptic number.

It is an amenable number.

27247000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27247000021 is an equidigital number, since it uses as much as digits as its factorization.

27247000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

Adding to 27247000021 its reverse (12000074272), we get a palindrome (39247074293).

The spelling of 27247000021 in words is "twenty-seven billion, two hundred forty-seven million, twenty-one", and thus it is an aban number.