211211221123 has 16 divisors (see below), whose sum is σ = 241713884160. Its totient is φ = 180791145216.

The previous prime is 211211221073. The next prime is 211211221129. The reversal of 211211221123 is 321122112112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211221123 is a prime.

It is a super-2 number, since 2×211211221123² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211211221123.

It is not an unprimeable number, because it can be changed into a prime (211211221129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18175411 + ... + 18187027.

It is an arithmetic number, because the mean of its divisors is an integer number (15107117760).

Almost surely, 2^211211221123 is an apocalyptic number.

211211221123 is a deficient number, since it is larger than the sum of its proper divisors (30502663037).

211211221123 is a wasteful number, since it uses less digits than its factorization.

211211221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14946.

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

Adding to 211211221123 its reverse (321122112112), we get a palindrome (532333333235).

The spelling of 211211221123 in words is "two hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-three".