2421378209 has 2 divisors, whose sum is σ = 2421378210. Its totient is φ = 2421378208.

The previous prime is 2421378181. The next prime is 2421378217. The reversal of 2421378209 is 9028731242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1377894400 + 1043483809 = 37120^2 + 32303^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421378209 - 2¹² = 2421374113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2421378269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210689104 + 1210689105.

It is an arithmetic number, because the mean of its divisors is an integer number (1210689105).

Almost surely, 2^2421378209 is an apocalyptic number.

It is an amenable number.

2421378209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421378209 is an equidigital number, since it uses as much as digits as its factorization.

2421378209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 2421378209 is about 49207.5015521008. The cubic root of 2421378209 is about 1342.8295094914.

The spelling of 2421378209 in words is "two billion, four hundred twenty-one million, three hundred seventy-eight thousand, two hundred nine".