213113210309 has 2 divisors, whose sum is σ = 213113210310. Its totient is φ = 213113210308.

The previous prime is 213113210287. The next prime is 213113210329. The reversal of 213113210309 is 903012311312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200618889025 + 12494321284 = 447905^2 + 111778^2 .

It is a cyclic number.

It is not a de Polignac number, because 213113210309 - 2⁸ = 213113210053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213113210329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106556605154 + 106556605155.

It is an arithmetic number, because the mean of its divisors is an integer number (106556605155).

Almost surely, 2^213113210309 is an apocalyptic number.

It is an amenable number.

213113210309 is a deficient number, since it is larger than the sum of its proper divisors (1).

213113210309 is an equidigital number, since it uses as much as digits as its factorization.

213113210309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 213113210309 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred ten thousand, three hundred nine".