213205640321 has 2 divisors, whose sum is σ = 213205640322. Its totient is φ = 213205640320.

The previous prime is 213205640317. The next prime is 213205640383. The reversal of 213205640321 is 123046502312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211633121296 + 1572519025 = 460036^2 + 39655^2 .

It is a cyclic number.

It is not a de Polignac number, because 213205640321 - 2² = 213205640317 is a prime.

It is not a weakly prime, because it can be changed into another prime (213205640621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106602820160 + 106602820161.

It is an arithmetic number, because the mean of its divisors is an integer number (106602820161).

Almost surely, 2^213205640321 is an apocalyptic number.

It is an amenable number.

213205640321 is a deficient number, since it is larger than the sum of its proper divisors (1).

213205640321 is an equidigital number, since it uses as much as digits as its factorization.

213205640321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 213205640321 in words is "two hundred thirteen billion, two hundred five million, six hundred forty thousand, three hundred twenty-one".