1321020017 has 2 divisors, whose sum is σ = 1321020018. Its totient is φ = 1321020016.

The previous prime is 1321020013. The next prime is 1321020053. The reversal of 1321020017 is 7100201231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1304365456 + 16654561 = 36116^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321020017 - 2² = 1321020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321019977 and 1321020004.

It is not a weakly prime, because it can be changed into another prime (1321020013) 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, 660510008 + 660510009.

It is an arithmetic number, because the mean of its divisors is an integer number (660510009).

Almost surely, 2^1321020017 is an apocalyptic number.

It is an amenable number.

1321020017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321020017 is an equidigital number, since it uses as much as digits as its factorization.

1321020017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 1321020017 is about 36345.8390603381. The cubic root of 1321020017 is about 1097.2437930869.

Adding to 1321020017 its reverse (7100201231), we get a palindrome (8421221248).

The spelling of 1321020017 in words is "one billion, three hundred twenty-one million, twenty thousand, seventeen".