135243121423 has 2 divisors, whose sum is σ = 135243121424. Its totient is φ = 135243121422.

The previous prime is 135243121369. The next prime is 135243121451. The reversal of 135243121423 is 324121342531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135243121423 - 2²¹ = 135241024271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135243101423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67621560711 + 67621560712.

It is an arithmetic number, because the mean of its divisors is an integer number (67621560712).

Almost surely, 2^135243121423 is an apocalyptic number.

135243121423 is a deficient number, since it is larger than the sum of its proper divisors (1).

135243121423 is an equidigital number, since it uses as much as digits as its factorization.

135243121423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 31.

Adding to 135243121423 its reverse (324121342531), we get a palindrome (459364463954).

The spelling of 135243121423 in words is "one hundred thirty-five billion, two hundred forty-three million, one hundred twenty-one thousand, four hundred twenty-three".