12021043423 has 2 divisors, whose sum is σ = 12021043424. Its totient is φ = 12021043422.

The previous prime is 12021043381. The next prime is 12021043427. The reversal of 12021043423 is 32434012021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12021043423 - 2¹³ = 12021035231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021043394 and 12021043403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021043427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010521711 + 6010521712.

It is an arithmetic number, because the mean of its divisors is an integer number (6010521712).

Almost surely, 2^12021043423 is an apocalyptic number.

12021043423 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021043423 is an equidigital number, since it uses as much as digits as its factorization.

12021043423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 12021043423 its reverse (32434012021), we get a palindrome (44455055444).

The spelling of 12021043423 in words is "twelve billion, twenty-one million, forty-three thousand, four hundred twenty-three".