1321220071 has 2 divisors, whose sum is σ = 1321220072. Its totient is φ = 1321220070.

The previous prime is 1321220063. The next prime is 1321220083. The reversal of 1321220071 is 1700221231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321220071 - 2³ = 1321220063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321220171) 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, 660610035 + 660610036.

It is an arithmetic number, because the mean of its divisors is an integer number (660610036).

Almost surely, 2^1321220071 is an apocalyptic number.

1321220071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321220071 is an equidigital number, since it uses as much as digits as its factorization.

1321220071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1321220071 is about 36348.5910455963. The cubic root of 1321220071 is about 1097.2991788058.

The spelling of 1321220071 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, seventy-one".