1001211211 has 16 divisors (see below), whose sum is σ = 1344284928. Its totient is φ = 720151200.

The previous prime is 1001211203. The next prime is 1001211221. The reversal of 1001211211 is 1121121001.

It is a cyclic number.

It is not a de Polignac number, because 1001211211 - 2³ = 1001211203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001211221) 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 in 15 ways as a sum of consecutive naturals, for example, 499105 + ... + 501106.

It is an arithmetic number, because the mean of its divisors is an integer number (84017808).

Almost surely, 2^1001211211 is an apocalyptic number.

1001211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1001211211 is a deficient number, since it is larger than the sum of its proper divisors (343073717).

1001211211 is a wasteful number, since it uses less digits than its factorization.

1001211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000242.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1001211211 is about 31641.9217336748. The cubic root of 1001211211 is about 1000.4035741060.

Adding to 1001211211 its reverse (1121121001), we get a palindrome (2122332212).

It can be divided in two parts, 1001 and 211211, that added together give a palindrome (212212).

The spelling of 1001211211 in words is "one billion, one million, two hundred eleven thousand, two hundred eleven".