220256321 has 2 divisors, whose sum is σ = 220256322. Its totient is φ = 220256320.

The previous prime is 220256317. The next prime is 220256327. The reversal of 220256321 is 123652022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214915600 + 5340721 = 14660^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 220256321 - 2² = 220256317 is a prime.

It is not a weakly prime, because it can be changed into another prime (220256327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110128160 + 110128161.

It is an arithmetic number, because the mean of its divisors is an integer number (110128161).

Almost surely, 2^220256321 is an apocalyptic number.

It is an amenable number.

220256321 is a deficient number, since it is larger than the sum of its proper divisors (1).

220256321 is an equidigital number, since it uses as much as digits as its factorization.

220256321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 220256321 is about 14841.0350380289. The cubic root of 220256321 is about 603.9154313786.

The spelling of 220256321 in words is "two hundred twenty million, two hundred fifty-six thousand, three hundred twenty-one".