201110011122221 has 2 divisors, whose sum is σ = 201110011122222. Its totient is φ = 201110011122220.

The previous prime is 201110011122203. The next prime is 201110011122227. The reversal of 201110011122221 is 122221110011102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192402282937225 + 8707728184996 = 13870915^2 + 2950886^2 .

It is a cyclic number.

It is not a de Polignac number, because 201110011122221 - 2²² = 201110006927917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201110011122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201110011122227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555005561110 + 100555005561111.

It is an arithmetic number, because the mean of its divisors is an integer number (100555005561111).

Almost surely, 2^{201110011122221} is an apocalyptic number.

It is an amenable number.

201110011122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201110011122221 is an equidigital number, since it uses as much as digits as its factorization.

201110011122221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201110011122221 its reverse (122221110011102), we get a palindrome (323331121133323).

The spelling of 201110011122221 in words is "two hundred one trillion, one hundred ten billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".