20212203311081 has 2 divisors, whose sum is σ = 20212203311082. Its totient is φ = 20212203311080.

The previous prime is 20212203311077. The next prime is 20212203311147. The reversal of 20212203311081 is 18011330221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10481671726681 + 9730531584400 = 3237541^2 + 3119380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212203311081 - 2² = 20212203311077 is a prime.

It is a super-3 number, since 3×20212203311081³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212203311081.

It is not a weakly prime, because it can be changed into another prime (20212203011081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106101655540 + 10106101655541.

It is an arithmetic number, because the mean of its divisors is an integer number (10106101655541).

Almost surely, 2^{20212203311081} is an apocalyptic number.

It is an amenable number.

20212203311081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212203311081 is an equidigital number, since it uses as much as digits as its factorization.

20212203311081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 20212203311081 its reverse (18011330221202), we get a palindrome (38223533532283).

The spelling of 20212203311081 in words is "twenty trillion, two hundred twelve billion, two hundred three million, three hundred eleven thousand, eighty-one".