213321307 has 2 divisors, whose sum is σ = 213321308. Its totient is φ = 213321306.

The previous prime is 213321289. The next prime is 213321313. The reversal of 213321307 is 703123312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213321307 - 2⁷ = 213321179 is a prime.

It is not a weakly prime, because it can be changed into another prime (213321007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106660653 + 106660654.

It is an arithmetic number, because the mean of its divisors is an integer number (106660654).

Almost surely, 2^213321307 is an apocalyptic number.

213321307 is a deficient number, since it is larger than the sum of its proper divisors (1).

213321307 is an equidigital number, since it uses as much as digits as its factorization.

213321307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 213321307 is about 14605.5231676240. The cubic root of 213321307 is about 597.5094045659.

Adding to 213321307 its reverse (703123312), we get a palindrome (916444619).

The spelling of 213321307 in words is "two hundred thirteen million, three hundred twenty-one thousand, three hundred seven".