2102406461209 has 2 divisors, whose sum is σ = 2102406461210. Its totient is φ = 2102406461208.

The previous prime is 2102406461107. The next prime is 2102406461237. The reversal of 2102406461209 is 9021646042012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1552329105625 + 550077355584 = 1245925^2 + 741672^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102406461209 - 2⁹ = 2102406460697 is a prime.

It is a super-2 number, since 2×2102406461209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102406461269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051203230604 + 1051203230605.

It is an arithmetic number, because the mean of its divisors is an integer number (1051203230605).

Almost surely, 2^{2102406461209} is an apocalyptic number.

It is an amenable number.

2102406461209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102406461209 is an equidigital number, since it uses as much as digits as its factorization.

2102406461209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 2102406461209 in words is "two trillion, one hundred two billion, four hundred six million, four hundred sixty-one thousand, two hundred nine".