13012012021 has 2 divisors, whose sum is σ = 13012012022. Its totient is φ = 13012012020.

The previous prime is 13012011979. The next prime is 13012012031. The reversal of 13012012021 is 12021021031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12480017796 + 531994225 = 111714^2 + 23065^2 .

It is an emirp because it is prime and its reverse (12021021031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13012012021 - 2¹⁹ = 13011487733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13012011992 and 13012012010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13012012031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6506006010 + 6506006011.

It is an arithmetic number, because the mean of its divisors is an integer number (6506006011).

Almost surely, 2^13012012021 is an apocalyptic number.

It is an amenable number.

13012012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13012012021 is an equidigital number, since it uses as much as digits as its factorization.

13012012021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 13012012021 its reverse (12021021031), we get a palindrome (25033033052).

The spelling of 13012012021 in words is "thirteen billion, twelve million, twelve thousand, twenty-one".