211221121223 has 24 divisors (see below), whose sum is σ = 264141100800. Its totient is φ = 167868551088.

The previous prime is 211221121193. The next prime is 211221121247. The reversal of 211221121223 is 322121122112.

It is not a de Polignac number, because 211221121223 - 2¹² = 211221117127 is a prime.

It is a super-2 number, since 2×211221121223² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221121195 and 211221121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221121723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2369813 + ... + 2457326.

It is an arithmetic number, because the mean of its divisors is an integer number (11005879200).

Almost surely, 2^211221121223 is an apocalyptic number.

211221121223 is a deficient number, since it is larger than the sum of its proper divisors (52919979577).

211221121223 is a wasteful number, since it uses less digits than its factorization.

211221121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827219 (or 4827212 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

Adding to 211221121223 its reverse (322121122112), we get a palindrome (533342243335).

The spelling of 211221121223 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-three".