13012043221 has 2 divisors, whose sum is σ = 13012043222. Its totient is φ = 13012043220.

The previous prime is 13012043203. The next prime is 13012043227. The reversal of 13012043221 is 12234021031.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11381902596 + 1630140625 = 106686^2 + 40375^2 .

It is a cyclic number.

It is not a de Polignac number, because 13012043221 - 2⁵ = 13012043189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13012043227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6506021610 + 6506021611.

It is an arithmetic number, because the mean of its divisors is an integer number (6506021611).

Almost surely, 2^13012043221 is an apocalyptic number.

It is an amenable number.

13012043221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13012043221 is an equidigital number, since it uses as much as digits as its factorization.

13012043221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13012043221 its reverse (12234021031), we get a palindrome (25246064252).

The spelling of 13012043221 in words is "thirteen billion, twelve million, forty-three thousand, two hundred twenty-one".