201106011721 has 2 divisors, whose sum is σ = 201106011722. Its totient is φ = 201106011720.

The previous prime is 201106011677. The next prime is 201106011763. The reversal of 201106011721 is 127110601102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195894760000 + 5211251721 = 442600^2 + 72189^2 .

It is a cyclic number.

It is not a de Polignac number, because 201106011721 - 2⁹ = 201106011209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201106011692 and 201106011701.

It is not a weakly prime, because it can be changed into another prime (201106011121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100553005860 + 100553005861.

It is an arithmetic number, because the mean of its divisors is an integer number (100553005861).

Almost surely, 2^201106011721 is an apocalyptic number.

It is an amenable number.

201106011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

201106011721 is an equidigital number, since it uses as much as digits as its factorization.

201106011721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 201106011721 its reverse (127110601102), we get a palindrome (328216612823).

The spelling of 201106011721 in words is "two hundred one billion, one hundred six million, eleven thousand, seven hundred twenty-one".