320221473251 has 2 divisors, whose sum is σ = 320221473252. Its totient is φ = 320221473250.

The previous prime is 320221473161. The next prime is 320221473293. The reversal of 320221473251 is 152374122023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320221473251 is a prime.

It is not a weakly prime, because it can be changed into another prime (320221473851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160110736625 + 160110736626.

It is an arithmetic number, because the mean of its divisors is an integer number (160110736626).

Almost surely, 2^320221473251 is an apocalyptic number.

320221473251 is a deficient number, since it is larger than the sum of its proper divisors (1).

320221473251 is an equidigital number, since it uses as much as digits as its factorization.

320221473251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 320221473251 its reverse (152374122023), we get a palindrome (472595595274).

The spelling of 320221473251 in words is "three hundred twenty billion, two hundred twenty-one million, four hundred seventy-three thousand, two hundred fifty-one".