1211311211 has 8 divisors (see below), whose sum is σ = 1322333424. Its totient is φ = 1100439520.

The previous prime is 1211311201. The next prime is 1211311219. The reversal of 1211311211 is 1121131121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211311211 - 2⁶ = 1211311147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211311219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20456 + ... + 53301.

It is an arithmetic number, because the mean of its divisors is an integer number (165291678).

Almost surely, 2^1211311211 is an apocalyptic number.

1211311211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211311211 is a deficient number, since it is larger than the sum of its proper divisors (111022213).

1211311211 is a wasteful number, since it uses less digits than its factorization.

1211311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75261.

The product of its digits is 12, while the sum is 14.

The square root of 1211311211 is about 34803.8964916286. The cubic root of 1211311211 is about 1065.9870094877.

Adding to 1211311211 its reverse (1121131121), we get a palindrome (2332442332).

The spelling of 1211311211 in words is "one billion, two hundred eleven million, three hundred eleven thousand, two hundred eleven".