1211323011287 has 2 divisors, whose sum is σ = 1211323011288. Its totient is φ = 1211323011286.

The previous prime is 1211323011253. The next prime is 1211323011289. The reversal of 1211323011287 is 7821103231121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211323011287 - 2⁴⁰ = 111811383511 is a prime.

Together with 1211323011289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211323011289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605661505643 + 605661505644.

It is an arithmetic number, because the mean of its divisors is an integer number (605661505644).

Almost surely, 2^{1211323011287} is an apocalyptic number.

1211323011287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211323011287 is an equidigital number, since it uses as much as digits as its factorization.

1211323011287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 1211323011287 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, eleven thousand, two hundred eighty-seven".