211221211123 has 8 divisors (see below), whose sum is σ = 229814039168. Its totient is φ = 192963389184.

The previous prime is 211221211109. The next prime is 211221211139. The reversal of 211221211123 is 321112122112.

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-211221211123 is a prime.

It is a super-2 number, since 2×211221211123² (a number of 23 digits) contains 22 as substring.

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 211221211123.

It is not an unprimeable number, because it can be changed into a prime (211221211723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83750211 + ... + 83752732.

It is an arithmetic number, because the mean of its divisors is an integer number (28726754896).

Almost surely, 2^211221211123 is an apocalyptic number.

211221211123 is a deficient number, since it is larger than the sum of its proper divisors (18592828045).

211221211123 is a wasteful number, since it uses less digits than its factorization.

211221211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167503053.

The product of its digits is 96, while the sum is 19.

Adding to 211221211123 its reverse (321112122112), we get a palindrome (532333333235).

The spelling of 211221211123 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-three".