201021130231309 has 2 divisors, whose sum is σ = 201021130231310. Its totient is φ = 201021130231308.

The previous prime is 201021130231291. The next prime is 201021130231331. The reversal of 201021130231309 is 903132031120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193187149075684 + 7833981155625 = 13899178^2 + 2798925^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021130231309 - 2²¹ = 201021128134157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021130231349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510565115654 + 100510565115655.

It is an arithmetic number, because the mean of its divisors is an integer number (100510565115655).

Almost surely, 2^{201021130231309} is an apocalyptic number.

It is an amenable number.

201021130231309 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021130231309 is an equidigital number, since it uses as much as digits as its factorization.

201021130231309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 201021130231309 in words is "two hundred one trillion, twenty-one billion, one hundred thirty million, two hundred thirty-one thousand, three hundred nine".