2123320021 has 2 divisors, whose sum is σ = 2123320022. Its totient is φ = 2123320020.

The previous prime is 2123319943. The next prime is 2123320033. The reversal of 2123320021 is 1200233212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1347697521 + 775622500 = 36711^2 + 27850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123320021 - 2⁹ = 2123319509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123319977 and 2123320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123320721) 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, 1061660010 + 1061660011.

It is an arithmetic number, because the mean of its divisors is an integer number (1061660011).

Almost surely, 2^2123320021 is an apocalyptic number.

It is an amenable number.

2123320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123320021 is an equidigital number, since it uses as much as digits as its factorization.

2123320021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2123320021 is about 46079.4967528943. The cubic root of 2123320021 is about 1285.3019060798.

Adding to 2123320021 its reverse (1200233212), we get a palindrome (3323553233).

It can be divided in two parts, 212 and 3320021, that added together give a palindrome (3320233).

The spelling of 2123320021 in words is "two billion, one hundred twenty-three million, three hundred twenty thousand, twenty-one".