68428121 has 2 divisors, whose sum is σ = 68428122. Its totient is φ = 68428120.

The previous prime is 68428117. The next prime is 68428123. The reversal of 68428121 is 12182486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 16516096 = 7205^2 + 4064^2 .

It is a cyclic number.

It is not a de Polignac number, because 68428121 - 2² = 68428117 is a prime.

It is a Sophie Germain prime.

Together with 68428123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68428123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34214060 + 34214061.

It is an arithmetic number, because the mean of its divisors is an integer number (34214061).

Almost surely, 2^68428121 is an apocalyptic number.

It is an amenable number.

68428121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68428121 is an equidigital number, since it uses as much as digits as its factorization.

68428121 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 68428121 is about 8272.1291696878. The cubic root of 68428121 is about 409.0203081321.

The spelling of 68428121 in words is "sixty-eight million, four hundred twenty-eight thousand, one hundred twenty-one".