27196125721 has 2 divisors, whose sum is σ = 27196125722. Its totient is φ = 27196125720.

The previous prime is 27196125709. The next prime is 27196125739. The reversal of 27196125721 is 12752169172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23939825625 + 3256300096 = 154725^2 + 57064^2 .

It is a cyclic number.

It is not a de Polignac number, because 27196125721 - 2⁵ = 27196125689 is a prime.

It is not a weakly prime, because it can be changed into another prime (27196125791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13598062860 + 13598062861.

It is an arithmetic number, because the mean of its divisors is an integer number (13598062861).

Almost surely, 2^27196125721 is an apocalyptic number.

It is an amenable number.

27196125721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27196125721 is an equidigital number, since it uses as much as digits as its factorization.

27196125721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The spelling of 27196125721 in words is "twenty-seven billion, one hundred ninety-six million, one hundred twenty-five thousand, seven hundred twenty-one".