27942121369 has 2 divisors, whose sum is σ = 27942121370. Its totient is φ = 27942121368.

The previous prime is 27942121357. The next prime is 27942121391. The reversal of 27942121369 is 96312124972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18723817225 + 9218304144 = 136835^2 + 96012^2 .

It is a cyclic number.

It is not a de Polignac number, because 27942121369 - 2²⁵ = 27908566937 is a prime.

It is a super-2 number, since 2×27942121369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27942121309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13971060684 + 13971060685.

It is an arithmetic number, because the mean of its divisors is an integer number (13971060685).

Almost surely, 2^27942121369 is an apocalyptic number.

It is an amenable number.

27942121369 is a deficient number, since it is larger than the sum of its proper divisors (1).

27942121369 is an equidigital number, since it uses as much as digits as its factorization.

27942121369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The spelling of 27942121369 in words is "twenty-seven billion, nine hundred forty-two million, one hundred twenty-one thousand, three hundred sixty-nine".