68842121 has 2 divisors, whose sum is σ = 68842122. Its totient is φ = 68842120.

The previous prime is 68842117. The next prime is 68842133. The reversal of 68842121 is 12124886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37884025 + 30958096 = 6155^2 + 5564^2 .

It is a cyclic number.

It is not a de Polignac number, because 68842121 - 2² = 68842117 is a prime.

It is not a weakly prime, because it can be changed into another prime (68842181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34421060 + 34421061.

It is an arithmetic number, because the mean of its divisors is an integer number (34421061).

Almost surely, 2^68842121 is an apocalyptic number.

It is an amenable number.

68842121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68842121 is an equidigital number, since it uses as much as digits as its factorization.

68842121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 68842121 is about 8297.1152215695. The cubic root of 68842121 is about 409.8435274419.

The spelling of 68842121 in words is "sixty-eight million, eight hundred forty-two thousand, one hundred twenty-one".