4042123212409 has 2 divisors, whose sum is σ = 4042123212410. Its totient is φ = 4042123212408.

The previous prime is 4042123212341. The next prime is 4042123212443. The reversal of 4042123212409 is 9042123212404.

It is an a-pointer prime, because the next prime (4042123212443) can be obtained adding 4042123212409 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4040582414400 + 1540798009 = 2010120^2 + 39253^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042123212409 - 2²³ = 4042114823801 is a prime.

It is not a weakly prime, because it can be changed into another prime (4042123213409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021061606204 + 2021061606205.

It is an arithmetic number, because the mean of its divisors is an integer number (2021061606205).

Almost surely, 2^{4042123212409} is an apocalyptic number.

It is an amenable number.

4042123212409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042123212409 is an equidigital number, since it uses as much as digits as its factorization.

4042123212409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 4042123212409 in words is "four trillion, forty-two billion, one hundred twenty-three million, two hundred twelve thousand, four hundred nine".