2021110221121 has 2 divisors, whose sum is σ = 2021110221122. Its totient is φ = 2021110221120.

The previous prime is 2021110221113. The next prime is 2021110221131. The reversal of 2021110221121 is 1211220111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208759518096 + 812350703025 = 1099436^2 + 901305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021110221121 - 2³ = 2021110221113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021110221095 and 2021110221104.

It is not a weakly prime, because it can be changed into another prime (2021110221131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555110560 + 1010555110561.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555110561).

Almost surely, 2^{2021110221121} is an apocalyptic number.

It is an amenable number.

2021110221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021110221121 is an equidigital number, since it uses as much as digits as its factorization.

2021110221121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2021110221121 its reverse (1211220111202), we get a palindrome (3232330332323).

The spelling of 2021110221121 in words is "two trillion, twenty-one billion, one hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".