213121303273 has 2 divisors, whose sum is σ = 213121303274. Its totient is φ = 213121303272.

The previous prime is 213121303207. The next prime is 213121303289. The reversal of 213121303273 is 372303121312.

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., 147519750889 + 65601552384 = 384083^2 + 256128^2 .

It is a cyclic number.

It is not a de Polignac number, because 213121303273 - 2⁹ = 213121302761 is a prime.

It is not a weakly prime, because it can be changed into another prime (214121303273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560651636 + 106560651637.

It is an arithmetic number, because the mean of its divisors is an integer number (106560651637).

Almost surely, 2^213121303273 is an apocalyptic number.

It is an amenable number.

213121303273 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121303273 is an equidigital number, since it uses as much as digits as its factorization.

213121303273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

Adding to 213121303273 its reverse (372303121312), we get a palindrome (585424424585).

The spelling of 213121303273 in words is "two hundred thirteen billion, one hundred twenty-one million, three hundred three thousand, two hundred seventy-three".