68221771 has 2 divisors, whose sum is σ = 68221772. Its totient is φ = 68221770.

The previous prime is 68221687. The next prime is 68221801. The reversal of 68221771 is 17712286.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68221771 is a prime.

It is not a weakly prime, because it can be changed into another prime (68221471) 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, 34110885 + 34110886.

It is an arithmetic number, because the mean of its divisors is an integer number (34110886).

Almost surely, 2^68221771 is an apocalyptic number.

68221771 is a deficient number, since it is larger than the sum of its proper divisors (1).

68221771 is an equidigital number, since it uses as much as digits as its factorization.

68221771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The square root of 68221771 is about 8259.6471474271. The cubic root of 68221771 is about 408.6087506163.

The spelling of 68221771 in words is "sixty-eight million, two hundred twenty-one thousand, seven hundred seventy-one".