68023421 has 2 divisors, whose sum is σ = 68023422. Its totient is φ = 68023420.

The previous prime is 68023411. The next prime is 68023447. The reversal of 68023421 is 12432086.

It is an a-pointer prime, because the next prime (68023447) can be obtained adding 68023421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 290521 = 8230^2 + 539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68023421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_4008635 and since 68023421 and 4008635 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68023411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34011710 + 34011711.

It is an arithmetic number, because the mean of its divisors is an integer number (34011711).

Almost surely, 2^68023421 is an apocalyptic number.

It is an amenable number.

68023421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68023421 is an equidigital number, since it uses as much as digits as its factorization.

68023421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 68023421 is about 8247.6312356943. The cubic root of 68023421 is about 408.2123658147.

The spelling of 68023421 in words is "sixty-eight million, twenty-three thousand, four hundred twenty-one".