201211020212261 has 2 divisors, whose sum is σ = 201211020212262. Its totient is φ = 201211020212260.

The previous prime is 201211020212227. The next prime is 201211020212273. The reversal of 201211020212261 is 162212020112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201020504548900 + 190515663361 = 14178170^2 + 436481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201211020212261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211020212291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605510106130 + 100605510106131.

It is an arithmetic number, because the mean of its divisors is an integer number (100605510106131).

Almost surely, 2^{201211020212261} is an apocalyptic number.

It is an amenable number.

201211020212261 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211020212261 is an equidigital number, since it uses as much as digits as its factorization.

201211020212261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 201211020212261 its reverse (162212020112102), we get a palindrome (363423040324363).

The spelling of 201211020212261 in words is "two hundred one trillion, two hundred eleven billion, twenty million, two hundred twelve thousand, two hundred sixty-one".