201100022261 has 2 divisors, whose sum is σ = 201100022262. Its totient is φ = 201100022260.

The previous prime is 201100022257. The next prime is 201100022273. The reversal of 201100022261 is 162220001102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132124980100 + 68975042161 = 363490^2 + 262631^2 .

It is a cyclic number.

It is not a de Polignac number, because 201100022261 - 2² = 201100022257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201100022561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550011130 + 100550011131.

It is an arithmetic number, because the mean of its divisors is an integer number (100550011131).

Almost surely, 2^201100022261 is an apocalyptic number.

It is an amenable number.

201100022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

201100022261 is an equidigital number, since it uses as much as digits as its factorization.

201100022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201100022261 its reverse (162220001102), we get a palindrome (363320023363).

The spelling of 201100022261 in words is "two hundred one billion, one hundred million, twenty-two thousand, two hundred sixty-one".