211221211113 has 48 divisors (see below), whose sum is σ = 347278853376. Its totient is φ = 127227237840.

The previous prime is 211221211109. The next prime is 211221211139. The reversal of 211221211113 is 311112122112.

It is a happy number.

It is not a de Polignac number, because 211221211113 - 2² = 211221211109 is a prime.

It is a super-2 number, since 2×211221211113² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221211913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 193306 + ... + 678092.

It is an arithmetic number, because the mean of its divisors is an integer number (7234976112).

Almost surely, 2^211221211113 is an apocalyptic number.

It is an amenable number.

211221211113 is a deficient number, since it is larger than the sum of its proper divisors (136057642263).

211221211113 is a wasteful number, since it uses less digits than its factorization.

211221211113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484976 (or 484964 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 211221211113 its reverse (311112122112), we get a palindrome (522333333225).

The spelling of 211221211113 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, one hundred thirteen".