211211221211 has 8 divisors (see below), whose sum is σ = 231346977120. Its totient is φ = 191932306048.

The previous prime is 211211221129. The next prime is 211211221223. The reversal of 211211221211 is 112122112112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211221211 is a prime.

It is a super-2 number, since 2×211211221211² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211221211.

It is not an unprimeable number, because it can be changed into a prime (211211220211) 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, 214209671 + ... + 214210656.

It is an arithmetic number, because the mean of its divisors is an integer number (28918372140).

Almost surely, 2^211211221211 is an apocalyptic number.

211211221211 is a deficient number, since it is larger than the sum of its proper divisors (20135755909).

211211221211 is a wasteful number, since it uses less digits than its factorization.

211211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428420373.

The product of its digits is 32, while the sum is 17.

Adding to 211211221211 its reverse (112122112112), we get a palindrome (323333333323).

The spelling of 211211221211 in words is "two hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".