2120324021 has 2 divisors, whose sum is σ = 2120324022. Its totient is φ = 2120324020.

The previous prime is 2120323921. The next prime is 2120324033. The reversal of 2120324021 is 1204230212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1351371121 + 768952900 = 36761^2 + 27730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120324021 - 2¹⁸ = 2120061877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120324221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060162010 + 1060162011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060162011).

Almost surely, 2^2120324021 is an apocalyptic number.

It is an amenable number.

2120324021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120324021 is an equidigital number, since it uses as much as digits as its factorization.

2120324021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2120324021 is about 46046.9762416600. The cubic root of 2120324021 is about 1284.6971021197.

Adding to 2120324021 its reverse (1204230212), we get a palindrome (3324554233).

The spelling of 2120324021 in words is "two billion, one hundred twenty million, three hundred twenty-four thousand, twenty-one".