27154627921 has 2 divisors, whose sum is σ = 27154627922. Its totient is φ = 27154627920.

The previous prime is 27154627889. The next prime is 27154627939. The reversal of 27154627921 is 12972645172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20459297296 + 6695330625 = 143036^2 + 81825^2 .

It is a cyclic number.

It is not a de Polignac number, because 27154627921 - 2⁵ = 27154627889 is a prime.

It is not a weakly prime, because it can be changed into another prime (27154627961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13577313960 + 13577313961.

It is an arithmetic number, because the mean of its divisors is an integer number (13577313961).

Almost surely, 2^27154627921 is an apocalyptic number.

It is an amenable number.

27154627921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27154627921 is an equidigital number, since it uses as much as digits as its factorization.

27154627921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The spelling of 27154627921 in words is "twenty-seven billion, one hundred fifty-four million, six hundred twenty-seven thousand, nine hundred twenty-one".