211221211111113 has 32 divisors (see below), whose sum is σ = 333491939251200. Its totient is φ = 116413389832896.

The previous prime is 211221211111109. The next prime is 211221211111223. The reversal of 211221211111113 is 311111112122112.

It is not a de Polignac number, because 211221211111113 - 2² = 211221211111109 is a prime.

It is a super-2 number, since 2×211221211111113² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 211221211111113.

It is not an unprimeable number, because it can be changed into a prime (211221211011113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1608209503 + ... + 1608340836.

It is an arithmetic number, because the mean of its divisors is an integer number (10421623101600).

Almost surely, 2^{211221211111113} is an apocalyptic number.

It is an amenable number.

211221211111113 is a deficient number, since it is larger than the sum of its proper divisors (122270728140087).

211221211111113 is a wasteful number, since it uses less digits than its factorization.

211221211111113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216550461.

The product of its digits is 48, while the sum is 21.

Adding to 211221211111113 its reverse (311111112122112), we get a palindrome (522332323233225).

The spelling of 211221211111113 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred thirteen".