2121002321 has 2 divisors, whose sum is σ = 2121002322. Its totient is φ = 2121002320.

The previous prime is 2121002287. The next prime is 2121002347. The reversal of 2121002321 is 1232001212.

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., 2033017921 + 87984400 = 45089^2 + 9380^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121002321 - 2¹⁰ = 2121001297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121002296 and 2121002305.

It is not a weakly prime, because it can be changed into another prime (2121002621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060501160 + 1060501161.

It is an arithmetic number, because the mean of its divisors is an integer number (1060501161).

Almost surely, 2^2121002321 is an apocalyptic number.

It is an amenable number.

2121002321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121002321 is an equidigital number, since it uses as much as digits as its factorization.

2121002321 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 2121002321 is about 46054.3409571780. The cubic root of 2121002321 is about 1284.8340807339.

Adding to 2121002321 its reverse (1232001212), we get a palindrome (3353003533).

The spelling of 2121002321 in words is "two billion, one hundred twenty-one million, two thousand, three hundred twenty-one".