1221022202171 has 2 divisors, whose sum is σ = 1221022202172. Its totient is φ = 1221022202170.

The previous prime is 1221022202137. The next prime is 1221022202237. The reversal of 1221022202171 is 1712022201221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221022202171 is a prime.

It is a super-2 number, since 2×1221022202171² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221022205171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610511101085 + 610511101086.

It is an arithmetic number, because the mean of its divisors is an integer number (610511101086).

Almost surely, 2^{1221022202171} is an apocalyptic number.

1221022202171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221022202171 is an equidigital number, since it uses as much as digits as its factorization.

1221022202171 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 1221022202171 its reverse (1712022201221), we get a palindrome (2933044403392).

The spelling of 1221022202171 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred two thousand, one hundred seventy-one".