12421423409 has 2 divisors, whose sum is σ = 12421423410. Its totient is φ = 12421423408.

The previous prime is 12421423381. The next prime is 12421423453. The reversal of 12421423409 is 90432412421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6720720400 + 5700703009 = 81980^2 + 75503^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421423409 - 2²⁴ = 12404646193 is a prime.

It is not a weakly prime, because it can be changed into another prime (12421423709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210711704 + 6210711705.

It is an arithmetic number, because the mean of its divisors is an integer number (6210711705).

Almost surely, 2^12421423409 is an apocalyptic number.

It is an amenable number.

12421423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421423409 is an equidigital number, since it uses as much as digits as its factorization.

12421423409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 12421423409 in words is "twelve billion, four hundred twenty-one million, four hundred twenty-three thousand, four hundred nine".