68107421 has 2 divisors, whose sum is σ = 68107422. Its totient is φ = 68107420.

The previous prime is 68107409. The next prime is 68107447. The reversal of 68107421 is 12470186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 33756100 = 5861^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 68107421 - 2⁶ = 68107357 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68107621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34053710 + 34053711.

It is an arithmetic number, because the mean of its divisors is an integer number (34053711).

Almost surely, 2^68107421 is an apocalyptic number.

It is an amenable number.

68107421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68107421 is an equidigital number, since it uses as much as digits as its factorization.

68107421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 68107421 is about 8252.7220357892. The cubic root of 68107421 is about 408.3803262682.

The spelling of 68107421 in words is "sixty-eight million, one hundred seven thousand, four hundred twenty-one".