27867571100021 has 2 divisors, whose sum is σ = 27867571100022. Its totient is φ = 27867571100020.

The previous prime is 27867571099889. The next prime is 27867571100041. The reversal of 27867571100021 is 12000117576872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18455186402500 + 9412384697521 = 4295950^2 + 3067961^2 .

It is a cyclic number.

It is not a de Polignac number, because 27867571100021 - 2²⁶ = 27867503991157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27867571100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933785550010 + 13933785550011.

It is an arithmetic number, because the mean of its divisors is an integer number (13933785550011).

Almost surely, 2^{27867571100021} is an apocalyptic number.

It is an amenable number.

27867571100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27867571100021 is an equidigital number, since it uses as much as digits as its factorization.

27867571100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 329280, while the sum is 47.

Adding to 27867571100021 its reverse (12000117576872), we get a palindrome (39867688676893).

The spelling of 27867571100021 in words is "twenty-seven trillion, eight hundred sixty-seven billion, five hundred seventy-one million, one hundred thousand, twenty-one".