1211304211 has 16 divisors (see below), whose sum is σ = 1320157440. Its totient is φ = 1104739200.

The previous prime is 1211304209. The next prime is 1211304217. The reversal of 1211304211 is 1124031121.

It is a cyclic number.

It is not a de Polignac number, because 1211304211 - 2¹ = 1211304209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211304217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132585 + ... + 1133653.

It is an arithmetic number, because the mean of its divisors is an integer number (82509840).

Almost surely, 2^1211304211 is an apocalyptic number.

1211304211 is a deficient number, since it is larger than the sum of its proper divisors (108853229).

1211304211 is a wasteful number, since it uses less digits than its factorization.

1211304211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211304211 is about 34803.7959280306. The cubic root of 1211304211 is about 1065.9849560866.

Adding to 1211304211 its reverse (1124031121), we get a palindrome (2335335332).

The spelling of 1211304211 in words is "one billion, two hundred eleven million, three hundred four thousand, two hundred eleven".