2121304243 has 2 divisors, whose sum is σ = 2121304244. Its totient is φ = 2121304242.

The previous prime is 2121304223. The next prime is 2121304249. The reversal of 2121304243 is 3424031212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121304243 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121304249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060652121 + 1060652122.

It is an arithmetic number, because the mean of its divisors is an integer number (1060652122).

Almost surely, 2^2121304243 is an apocalyptic number.

2121304243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121304243 is an equidigital number, since it uses as much as digits as its factorization.

2121304243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2121304243 is about 46057.6187291527. The cubic root of 2121304243 is about 1284.8950426773.

Adding to 2121304243 its reverse (3424031212), we get a palindrome (5545335455).

The spelling of 2121304243 in words is "two billion, one hundred twenty-one million, three hundred four thousand, two hundred forty-three".