2121343409 has 2 divisors, whose sum is σ = 2121343410. Its totient is φ = 2121343408.

The previous prime is 2121343387. The next prime is 2121343439. The reversal of 2121343409 is 9043431212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2106351025 + 14992384 = 45895^2 + 3872^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121343409 - 2²⁰ = 2120294833 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121343439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060671704 + 1060671705.

It is an arithmetic number, because the mean of its divisors is an integer number (1060671705).

Almost surely, 2^2121343409 is an apocalyptic number.

It is an amenable number.

2121343409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121343409 is an equidigital number, since it uses as much as digits as its factorization.

2121343409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2121343409 is about 46058.0439120030. The cubic root of 2121343409 is about 1284.9029503736.

The spelling of 2121343409 in words is "two billion, one hundred twenty-one million, three hundred forty-three thousand, four hundred nine".