121223311243 has 2 divisors, whose sum is σ = 121223311244. Its totient is φ = 121223311242.

The previous prime is 121223311229. The next prime is 121223311259. The reversal of 121223311243 is 342113322121.

It is a weak prime.

It is an emirp because it is prime and its reverse (342113322121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121223311243 - 2²⁵ = 121189756811 is a prime.

It is not a weakly prime, because it can be changed into another prime (121223351243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611655621 + 60611655622.

It is an arithmetic number, because the mean of its divisors is an integer number (60611655622).

Almost surely, 2^121223311243 is an apocalyptic number.

121223311243 is a deficient number, since it is larger than the sum of its proper divisors (1).

121223311243 is an equidigital number, since it uses as much as digits as its factorization.

121223311243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

Adding to 121223311243 its reverse (342113322121), we get a palindrome (463336633364).

The spelling of 121223311243 in words is "one hundred twenty-one billion, two hundred twenty-three million, three hundred eleven thousand, two hundred forty-three".