2021122121 has 2 divisors, whose sum is σ = 2021122122. Its totient is φ = 2021122120.

The previous prime is 2021122111. The next prime is 2021122141. The reversal of 2021122121 is 1212211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2016010000 + 5112121 = 44900^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021122121 - 2⁶ = 2021122057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021122096 and 2021122105.

It is not a weakly prime, because it can be changed into another prime (2021122111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010561060 + 1010561061.

It is an arithmetic number, because the mean of its divisors is an integer number (1010561061).

Almost surely, 2^2021122121 is an apocalyptic number.

It is an amenable number.

2021122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021122121 is an equidigital number, since it uses as much as digits as its factorization.

2021122121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2021122121 is about 44956.8918075972. The cubic root of 2021122121 is about 1264.3408942828.

Adding to 2021122121 its reverse (1212211202), we get a palindrome (3233333323).

The spelling of 2021122121 in words is "two billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".