1211201111243 has 2 divisors, whose sum is σ = 1211201111244. Its totient is φ = 1211201111242.

The previous prime is 1211201111147. The next prime is 1211201111257. The reversal of 1211201111243 is 3421111021121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211201111243 - 2²⁴ = 1211184334027 is a prime.

It is a super-2 number, since 2×1211201111243² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211201111273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600555621 + 605600555622.

It is an arithmetic number, because the mean of its divisors is an integer number (605600555622).

Almost surely, 2^{1211201111243} is an apocalyptic number.

1211201111243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211201111243 is an equidigital number, since it uses as much as digits as its factorization.

1211201111243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1211201111243 its reverse (3421111021121), we get a palindrome (4632312132364).

The spelling of 1211201111243 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred eleven thousand, two hundred forty-three".