211121211 has 8 divisors (see below), whose sum is σ = 321708544. Its totient is φ = 120640680.

The previous prime is 211121203. The next prime is 211121213. The reversal of 211121211 is 112121112.

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

It is not a de Polignac number, because 211121211 - 2³ = 211121203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5026675 + ... + 5026716.

It is an arithmetic number, because the mean of its divisors is an integer number (40213568).

Almost surely, 2^211121211 is an apocalyptic number.

211121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211121211 is a deficient number, since it is larger than the sum of its proper divisors (110587333).

211121211 is a wasteful number, since it uses less digits than its factorization.

211121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10053401.

The product of its digits is 8, while the sum is 12.

The square root of 211121211 is about 14530.0107019919. The cubic root of 211121211 is about 595.4481579932.

Adding to 211121211 its reverse (112121112), we get a palindrome (323242323).

Subtracting from 211121211 its reverse (112121112), we obtain a palindrome (99000099).

The spelling of 211121211 in words is "two hundred eleven million, one hundred twenty-one thousand, two hundred eleven".