2123330021 has 2 divisors, whose sum is σ = 2123330022. Its totient is φ = 2123330020.

The previous prime is 2123329997. The next prime is 2123330023. The reversal of 2123330021 is 1200333212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1999341796 + 123988225 = 44714^2 + 11135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123330021 - 2¹⁰ = 2123328997 is a prime.

Together with 2123330023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123330023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061665010 + 1061665011.

It is an arithmetic number, because the mean of its divisors is an integer number (1061665011).

Almost surely, 2^2123330021 is an apocalyptic number.

It is an amenable number.

2123330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123330021 is an equidigital number, since it uses as much as digits as its factorization.

2123330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 2123330021 is about 46079.6052608961. The cubic root of 2123330021 is about 1285.3039238317.

Adding to 2123330021 its reverse (1200333212), we get a palindrome (3323663233).

The spelling of 2123330021 in words is "two billion, one hundred twenty-three million, three hundred thirty thousand, twenty-one".