2121212323 has 2 divisors, whose sum is σ = 2121212324. Its totient is φ = 2121212322.

The previous prime is 2121212321. The next prime is 2121212369. The reversal of 2121212323 is 3232121212.

2121212323 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121212323 - 2¹ = 2121212321 is a prime.

Together with 2121212321, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2121212323.

It is not a weakly prime, because it can be changed into another prime (2121212321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060606161 + 1060606162.

It is an arithmetic number, because the mean of its divisors is an integer number (1060606162).

Almost surely, 2^2121212323 is an apocalyptic number.

2121212323 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121212323 is an equidigital number, since it uses as much as digits as its factorization.

2121212323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 2121212323 is about 46056.6208378339. The cubic root of 2121212323 is about 1284.8764834570.

Adding to 2121212323 its reverse (3232121212), we get a palindrome (5353333535).

The spelling of 2121212323 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty-three".