12134232421 has 2 divisors, whose sum is σ = 12134232422. Its totient is φ = 12134232420.

The previous prime is 12134232413. The next prime is 12134232437. The reversal of 12134232421 is 12423243121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11667024196 + 467208225 = 108014^2 + 21615^2 .

It is an emirp because it is prime and its reverse (12423243121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12134232421 - 2³ = 12134232413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12134232491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6067116210 + 6067116211.

It is an arithmetic number, because the mean of its divisors is an integer number (6067116211).

Almost surely, 2^12134232421 is an apocalyptic number.

It is an amenable number.

12134232421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12134232421 is an equidigital number, since it uses as much as digits as its factorization.

12134232421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 25.

Adding to 12134232421 its reverse (12423243121), we get a palindrome (24557475542).

The spelling of 12134232421 in words is "twelve billion, one hundred thirty-four million, two hundred thirty-two thousand, four hundred twenty-one".