1020220321 has 2 divisors, whose sum is σ = 1020220322. Its totient is φ = 1020220320.

The previous prime is 1020220307. The next prime is 1020220339. The reversal of 1020220321 is 1230220201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988410721 + 31809600 = 31439^2 + 5640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020220321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020220301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110160 + 510110161.

It is an arithmetic number, because the mean of its divisors is an integer number (510110161).

Almost surely, 2^1020220321 is an apocalyptic number.

It is an amenable number.

1020220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020220321 is an equidigital number, since it uses as much as digits as its factorization.

1020220321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1020220321 is about 31940.8879181528. The cubic root of 1020220321 is about 1006.6951815064.

Adding to 1020220321 its reverse (1230220201), we get a palindrome (2250440522).

The spelling of 1020220321 in words is "one billion, twenty million, two hundred twenty thousand, three hundred twenty-one".