1220221022171 has 2 divisors, whose sum is σ = 1220221022172. Its totient is φ = 1220221022170.

The previous prime is 1220221022131. The next prime is 1220221022243. The reversal of 1220221022171 is 1712201220221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220221022171 - 2¹⁸ = 1220220760027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220221022131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110511085 + 610110511086.

It is an arithmetic number, because the mean of its divisors is an integer number (610110511086).

Almost surely, 2^{1220221022171} is an apocalyptic number.

1220221022171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221022171 is an equidigital number, since it uses as much as digits as its factorization.

1220221022171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 1220221022171 its reverse (1712201220221), we get a palindrome (2932422242392).

The spelling of 1220221022171 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, twenty-two thousand, one hundred seventy-one".