1210110221909 has 2 divisors, whose sum is σ = 1210110221910. Its totient is φ = 1210110221908.

The previous prime is 1210110221821. The next prime is 1210110222023. The reversal of 1210110221909 is 9091220110121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205336102884 + 4774119025 = 1097878^2 + 69095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210110221909 - 2¹⁶ = 1210110156373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210110221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605055110954 + 605055110955.

It is an arithmetic number, because the mean of its divisors is an integer number (605055110955).

Almost surely, 2^{1210110221909} is an apocalyptic number.

It is an amenable number.

1210110221909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210110221909 is an equidigital number, since it uses as much as digits as its factorization.

1210110221909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1210110221909 in words is "one trillion, two hundred ten billion, one hundred ten million, two hundred twenty-one thousand, nine hundred nine".