12013424021 has 2 divisors, whose sum is σ = 12013424022. Its totient is φ = 12013424020.

The previous prime is 12013424011. The next prime is 12013424039. The reversal of 12013424021 is 12042431021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7336779025 + 4676644996 = 85655^2 + 68386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12013424021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12013423984 and 12013424002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12013424011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006712010 + 6006712011.

It is an arithmetic number, because the mean of its divisors is an integer number (6006712011).

Almost surely, 2^12013424021 is an apocalyptic number.

It is an amenable number.

12013424021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013424021 is an equidigital number, since it uses as much as digits as its factorization.

12013424021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12013424021 its reverse (12042431021), we get a palindrome (24055855042).

The spelling of 12013424021 in words is "twelve billion, thirteen million, four hundred twenty-four thousand, twenty-one".