201021310109 has 2 divisors, whose sum is σ = 201021310110. Its totient is φ = 201021310108.

The previous prime is 201021310081. The next prime is 201021310153. The reversal of 201021310109 is 901013120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199992312025 + 1028998084 = 447205^2 + 32078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021310109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021310709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510655054 + 100510655055.

It is an arithmetic number, because the mean of its divisors is an integer number (100510655055).

Almost surely, 2^201021310109 is an apocalyptic number.

It is an amenable number.

201021310109 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021310109 is an equidigital number, since it uses as much as digits as its factorization.

201021310109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 201021310109 in words is "two hundred one billion, twenty-one million, three hundred ten thousand, one hundred nine".