201021310709 has 2 divisors, whose sum is σ = 201021310710. Its totient is φ = 201021310708.

The previous prime is 201021310691. The next prime is 201021310771. The reversal of 201021310709 is 907013120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191277646609 + 9743664100 = 437353^2 + 98710^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021310709 - 2²⁴ = 201004533493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021310109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510655354 + 100510655355.

It is an arithmetic number, because the mean of its divisors is an integer number (100510655355).

Almost surely, 2^201021310709 is an apocalyptic number.

It is an amenable number.

201021310709 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021310709 is an equidigital number, since it uses as much as digits as its factorization.

201021310709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The spelling of 201021310709 in words is "two hundred one billion, twenty-one million, three hundred ten thousand, seven hundred nine".