2120122021 has 2 divisors, whose sum is σ = 2120122022. Its totient is φ = 2120122020.

The previous prime is 2120122001. The next prime is 2120122031. The reversal of 2120122021 is 1202210212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784133121 + 335988900 = 42239^2 + 18330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120122021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120121992 and 2120122010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120122001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060061010 + 1060061011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060061011).

Almost surely, 2^2120122021 is an apocalyptic number.

It is an amenable number.

2120122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120122021 is an equidigital number, since it uses as much as digits as its factorization.

2120122021 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 13.

The square root of 2120122021 is about 46044.7827772051. The cubic root of 2120122021 is about 1284.6563037867.

Adding to 2120122021 its reverse (1202210212), we get a palindrome (3322332233).

The spelling of 2120122021 in words is "two billion, one hundred twenty million, one hundred twenty-two thousand, twenty-one".