211221210211123 has 8 divisors (see below), whose sum is σ = 241398453994848. Its totient is φ = 181044662722944.

The previous prime is 211221210211073. The next prime is 211221210211133. The reversal of 211221210211123 is 321112012122112.

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

It is a cyclic number.

It is not a de Polignac number, because 211221210211123 - 2²⁹ = 211220673340211 is a prime.

It is a super-2 number, since 2×211221210211123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221210211094 and 211221210211103.

It is not an unprimeable number, because it can be changed into a prime (211221210211133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173423686 + ... + 174637387.

It is an arithmetic number, because the mean of its divisors is an integer number (30174806749356).

Almost surely, 2^{211221210211123} is an apocalyptic number.

211221210211123 is a deficient number, since it is larger than the sum of its proper divisors (30177243783725).

211221210211123 is an equidigital number, since it uses as much as digits as its factorization.

211221210211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348147773.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 211221210211123 its reverse (321112012122112), we get a palindrome (532333222333235).

The spelling of 211221210211123 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, one hundred twenty-three".