27859459721 has 2 divisors, whose sum is σ = 27859459722. Its totient is φ = 27859459720.

The previous prime is 27859459717. The next prime is 27859459723. The reversal of 27859459721 is 12795495872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27820572025 + 38887696 = 166795^2 + 6236^2 .

It is a cyclic number.

It is not a de Polignac number, because 27859459721 - 2² = 27859459717 is a prime.

It is a super-2 number, since 2×27859459721² (a number of 22 digits) contains 22 as substring.

Together with 27859459723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27859459723) 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, 13929729860 + 13929729861.

It is an arithmetic number, because the mean of its divisors is an integer number (13929729861).

Almost surely, 2^27859459721 is an apocalyptic number.

It is an amenable number.

27859459721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27859459721 is an equidigital number, since it uses as much as digits as its factorization.

27859459721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 59.

The spelling of 27859459721 in words is "twenty-seven billion, eight hundred fifty-nine million, four hundred fifty-nine thousand, seven hundred twenty-one".