211223313221 has 16 divisors (see below), whose sum is σ = 213540096000. Its totient is φ = 208920342528.

The previous prime is 211223313181. The next prime is 211223313251. The reversal of 211223313221 is 122313322112.

It is a cyclic number.

It is not a de Polignac number, because 211223313221 - 2¹⁰ = 211223312197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223313251) 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, 42048716 + ... + 42053738.

It is an arithmetic number, because the mean of its divisors is an integer number (13346256000).

Almost surely, 2^211223313221 is an apocalyptic number.

It is an amenable number.

211223313221 is a deficient number, since it is larger than the sum of its proper divisors (2316782779).

211223313221 is a wasteful number, since it uses less digits than its factorization.

211223313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308.

The product of its digits is 864, while the sum is 23.

Adding to 211223313221 its reverse (122313322112), we get a palindrome (333536635333).

The spelling of 211223313221 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred thirteen thousand, two hundred twenty-one".