1211111113253 has 2 divisors, whose sum is σ = 1211111113254. Its totient is φ = 1211111113252.

The previous prime is 1211111113207. The next prime is 1211111113297. The reversal of 1211111113253 is 3523111111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662151630529 + 548959482724 = 813727^2 + 740918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211111113253 - 2¹⁶ = 1211111047717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211111313253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555556626 + 605555556627.

It is an arithmetic number, because the mean of its divisors is an integer number (605555556627).

Almost surely, 2^{1211111113253} is an apocalyptic number.

It is an amenable number.

1211111113253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211111113253 is an equidigital number, since it uses as much as digits as its factorization.

1211111113253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 23.

Adding to 1211111113253 its reverse (3523111111121), we get a palindrome (4734222224374).

The spelling of 1211111113253 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred thirteen thousand, two hundred fifty-three".