1220221001171 has 2 divisors, whose sum is σ = 1220221001172. Its totient is φ = 1220221001170.

The previous prime is 1220221001147. The next prime is 1220221001249. The reversal of 1220221001171 is 1711001220221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220221001171 - 2³⁰ = 1219147259347 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1220221001141) 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, 610110500585 + 610110500586.

It is an arithmetic number, because the mean of its divisors is an integer number (610110500586).

Almost surely, 2^{1220221001171} is an apocalyptic number.

1220221001171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221001171 is an equidigital number, since it uses as much as digits as its factorization.

1220221001171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1220221001171 its reverse (1711001220221), we get a palindrome (2931222221392).

The spelling of 1220221001171 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one thousand, one hundred seventy-one".