211221222112111 has 8 divisors (see below), whose sum is σ = 222627442956480. Its totient is φ = 200089849962912.

The previous prime is 211221222112099. The next prime is 211221222112177. The reversal of 211221222112111 is 111211222122112.

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 211221222112111 - 2¹⁹ = 211221221587823 is a prime.

It is a super-2 number, since 2×211221222112111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221222112711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68712172215 + ... + 68712175288.

It is an arithmetic number, because the mean of its divisors is an integer number (27828430369560).

Almost surely, 2^{211221222112111} is an apocalyptic number.

211221222112111 is a deficient number, since it is larger than the sum of its proper divisors (11406220844369).

211221222112111 is a wasteful number, since it uses less digits than its factorization.

211221222112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137424347585.

The product of its digits is 128, while the sum is 22.

Adding to 211221222112111 its reverse (111211222122112), we get a palindrome (322432444234223).

The spelling of 211221222112111 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred eleven".