12013010021 has 2 divisors, whose sum is σ = 12013010022. Its totient is φ = 12013010020.

The previous prime is 12013010017. The next prime is 12013010047. The reversal of 12013010021 is 12001031021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10862850625 + 1150159396 = 104225^2 + 33914^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013010021 - 2² = 12013010017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12013009984 and 12013010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12013010521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006505010 + 6006505011.

It is an arithmetic number, because the mean of its divisors is an integer number (6006505011).

Almost surely, 2^12013010021 is an apocalyptic number.

It is an amenable number.

12013010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013010021 is an equidigital number, since it uses as much as digits as its factorization.

12013010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 12013010021 its reverse (12001031021), we get a palindrome (24014041042).

The spelling of 12013010021 in words is "twelve billion, thirteen million, ten thousand, twenty-one".