1211122121263 has 2 divisors, whose sum is σ = 1211122121264. Its totient is φ = 1211122121262.

The previous prime is 1211122121191. The next prime is 1211122121267. The reversal of 1211122121263 is 3621212211121.

It is a strong prime.

It is an emirp because it is prime and its reverse (3621212211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211122121263 - 2⁹ = 1211122120751 is a prime.

It is a super-2 number, since 2×1211122121263² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211122121267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605561060631 + 605561060632.

It is an arithmetic number, because the mean of its divisors is an integer number (605561060632).

Almost surely, 2^{1211122121263} is an apocalyptic number.

1211122121263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211122121263 is an equidigital number, since it uses as much as digits as its factorization.

1211122121263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

Adding to 1211122121263 its reverse (3621212211121), we get a palindrome (4832334332384).

The spelling of 1211122121263 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred sixty-three".