201220111110001 has 2 divisors, whose sum is σ = 201220111110002. Its totient is φ = 201220111110000.

The previous prime is 201220111109971. The next prime is 201220111110013. The reversal of 201220111110001 is 100011111022102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154226618277601 + 46993492832400 = 12418801^2 + 6855180^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220111110001 - 2³⁷ = 201082672156529 is a prime.

It is a super-2 number, since 2×201220111110001² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201220111110041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610055555000 + 100610055555001.

It is an arithmetic number, because the mean of its divisors is an integer number (100610055555001).

Almost surely, 2^{201220111110001} is an apocalyptic number.

It is an amenable number.

201220111110001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220111110001 is an equidigital number, since it uses as much as digits as its factorization.

201220111110001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201220111110001 its reverse (100011111022102), we get a palindrome (301231222132103).

The spelling of 201220111110001 in words is "two hundred one trillion, two hundred twenty billion, one hundred eleven million, one hundred ten thousand, one".