2123102021 has 2 divisors, whose sum is σ = 2123102022. Its totient is φ = 2123102020.

The previous prime is 2123102017. The next prime is 2123102027. The reversal of 2123102021 is 1202013212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1684199521 + 438902500 = 41039^2 + 20950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123102021 - 2² = 2123102017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123101987 and 2123102005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123102027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061551010 + 1061551011.

It is an arithmetic number, because the mean of its divisors is an integer number (1061551011).

Almost surely, 2^2123102021 is an apocalyptic number.

It is an amenable number.

2123102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123102021 is an equidigital number, since it uses as much as digits as its factorization.

2123102021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2123102021 is about 46077.1312149530. The cubic root of 2123102021 is about 1285.2579175143.

Adding to 2123102021 its reverse (1202013212), we get a palindrome (3325115233).

The spelling of 2123102021 in words is "two billion, one hundred twenty-three million, one hundred two thousand, twenty-one".