68215321 has 2 divisors, whose sum is σ = 68215322. Its totient is φ = 68215320.

The previous prime is 68215261. The next prime is 68215327. The reversal of 68215321 is 12351286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43414921 + 24800400 = 6589^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 68215321 - 2⁷ = 68215193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68215321.

It is not a weakly prime, because it can be changed into another prime (68215327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34107660 + 34107661.

It is an arithmetic number, because the mean of its divisors is an integer number (34107661).

Almost surely, 2^68215321 is an apocalyptic number.

It is an amenable number.

68215321 is a deficient number, since it is larger than the sum of its proper divisors (1).

68215321 is an equidigital number, since it uses as much as digits as its factorization.

68215321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 68215321 is about 8259.2566856830. The cubic root of 68215321 is about 408.5958729603.

The spelling of 68215321 in words is "sixty-eight million, two hundred fifteen thousand, three hundred twenty-one".