2121110111243 has 2 divisors, whose sum is σ = 2121110111244. Its totient is φ = 2121110111242.

The previous prime is 2121110111201. The next prime is 2121110111257. The reversal of 2121110111243 is 3421110111212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121110111243 - 2¹⁰ = 2121110110219 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121110131243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060555055621 + 1060555055622.

It is an arithmetic number, because the mean of its divisors is an integer number (1060555055622).

Almost surely, 2^{2121110111243} is an apocalyptic number.

2121110111243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121110111243 is an equidigital number, since it uses as much as digits as its factorization.

2121110111243 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 2121110111243 its reverse (3421110111212), we get a palindrome (5542220222455).

The spelling of 2121110111243 in words is "two trillion, one hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, two hundred forty-three".