1212311021171 has 2 divisors, whose sum is σ = 1212311021172. Its totient is φ = 1212311021170.

The previous prime is 1212311021149. The next prime is 1212311021177. The reversal of 1212311021171 is 1711201132121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212311021171 - 2¹⁴ = 1212311004787 is a prime.

It is a super-2 number, since 2×1212311021171² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1212311021177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606155510585 + 606155510586.

It is an arithmetic number, because the mean of its divisors is an integer number (606155510586).

Almost surely, 2^{1212311021171} is an apocalyptic number.

1212311021171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311021171 is an equidigital number, since it uses as much as digits as its factorization.

1212311021171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 23.

Adding to 1212311021171 its reverse (1711201132121), we get a palindrome (2923512153292).

The spelling of 1212311021171 in words is "one trillion, two hundred twelve billion, three hundred eleven million, twenty-one thousand, one hundred seventy-one".