2021122211081 has 2 divisors, whose sum is σ = 2021122211082. Its totient is φ = 2021122211080.

The previous prime is 2021122211077. The next prime is 2021122211131. The reversal of 2021122211081 is 1801122211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1944395981056 + 76726230025 = 1394416^2 + 276995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021122211081 - 2² = 2021122211077 is a prime.

It is a super-3 number, since 3×2021122211081³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2021122211681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010561105540 + 1010561105541.

It is an arithmetic number, because the mean of its divisors is an integer number (1010561105541).

Almost surely, 2^{2021122211081} is an apocalyptic number.

It is an amenable number.

2021122211081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021122211081 is an equidigital number, since it uses as much as digits as its factorization.

2021122211081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 2021122211081 its reverse (1801122211202), we get a palindrome (3822244422283).

The spelling of 2021122211081 in words is "two trillion, twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, eighty-one".