68563421 has 2 divisors, whose sum is σ = 68563422. Its totient is φ = 68563420.

The previous prime is 68563409. The next prime is 68563423. The reversal of 68563421 is 12436586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51998521 + 16564900 = 7211^2 + 4070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68563421 is a prime.

Together with 68563423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68563423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34281710 + 34281711.

It is an arithmetic number, because the mean of its divisors is an integer number (34281711).

Almost surely, 2^68563421 is an apocalyptic number.

It is an amenable number.

68563421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68563421 is an equidigital number, since it uses as much as digits as its factorization.

68563421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 68563421 is about 8280.3031949319. The cubic root of 68563421 is about 409.2897101109.

The spelling of 68563421 in words is "sixty-eight million, five hundred sixty-three thousand, four hundred twenty-one".