1220021222171 has 2 divisors, whose sum is σ = 1220021222172. Its totient is φ = 1220021222170.

The previous prime is 1220021222153. The next prime is 1220021222177. The reversal of 1220021222171 is 1712221200221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220021222171 - 2³⁰ = 1218947480347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220021222177) 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, 610010611085 + 610010611086.

It is an arithmetic number, because the mean of its divisors is an integer number (610010611086).

Almost surely, 2^{1220021222171} is an apocalyptic number.

1220021222171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220021222171 is an equidigital number, since it uses as much as digits as its factorization.

1220021222171 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1220021222171 its reverse (1712221200221), we get a palindrome (2932242422392).

The spelling of 1220021222171 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty-two thousand, one hundred seventy-one".