1211323213171 has 2 divisors, whose sum is σ = 1211323213172. Its totient is φ = 1211323213170.

The previous prime is 1211323213153. The next prime is 1211323213201. The reversal of 1211323213171 is 1713123231121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211323213171 - 2¹³ = 1211323204979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211323217171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605661606585 + 605661606586.

It is an arithmetic number, because the mean of its divisors is an integer number (605661606586).

Almost surely, 2^{1211323213171} is an apocalyptic number.

1211323213171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211323213171 is an equidigital number, since it uses as much as digits as its factorization.

1211323213171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

Adding to 1211323213171 its reverse (1713123231121), we get a palindrome (2924446444292).

The spelling of 1211323213171 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, two hundred thirteen thousand, one hundred seventy-one".