1212111155671 has 12 divisors (see below), whose sum is σ = 1314012702240. Its totient is φ = 1117601696640.

The previous prime is 1212111155669. The next prime is 1212111155729. The reversal of 1212111155671 is 1765511112121.

It is not a de Polignac number, because 1212111155671 - 2¹ = 1212111155669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111155611) 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 in 11 ways as a sum of consecutive naturals, for example, 3921631 + ... + 4219408.

It is an arithmetic number, because the mean of its divisors is an integer number (109501058520).

Almost surely, 2^{1212111155671} is an apocalyptic number.

1212111155671 is a deficient number, since it is larger than the sum of its proper divisors (101901546569).

1212111155671 is an equidigital number, since it uses as much as digits as its factorization.

1212111155671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8141946 (or 8141933 counting only the distinct ones).

The product of its digits is 4200, while the sum is 34.

Adding to 1212111155671 its reverse (1765511112121), we get a palindrome (2977622267792).

The spelling of 1212111155671 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred fifty-five thousand, six hundred seventy-one".