201211220120221 has 2 divisors, whose sum is σ = 201211220120222. Its totient is φ = 201211220120220.

The previous prime is 201211220120219. The next prime is 201211220120231. The reversal of 201211220120221 is 122021022112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102009899000025 + 99201321120196 = 10099995^2 + 9959986^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211220120221 - 2¹ = 201211220120219 is a prime.

Together with 201211220120219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211220120201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605610060110 + 100605610060111.

It is an arithmetic number, because the mean of its divisors is an integer number (100605610060111).

Almost surely, 2^{201211220120221} is an apocalyptic number.

It is an amenable number.

201211220120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211220120221 is an equidigital number, since it uses as much as digits as its factorization.

201211220120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201211220120221 its reverse (122021022112102), we get a palindrome (323232242232323).

The spelling of 201211220120221 in words is "two hundred one trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty thousand, two hundred twenty-one".