210111111221 has 8 divisors (see below), whose sum is σ = 229373215104. Its totient is φ = 190875856320.

The previous prime is 210111111191. The next prime is 210111111229. The reversal of 210111111221 is 122111111012.

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 210111111221 - 2³⁴ = 192931242037 is a prime.

It is a super-2 number, since 2×210111111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210111111196 and 210111111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111111229) 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 7 ways as a sum of consecutive naturals, for example, 6695876 + ... + 6727181.

It is an arithmetic number, because the mean of its divisors is an integer number (28671651888).

Almost surely, 2^210111111221 is an apocalyptic number.

It is an amenable number.

210111111221 is a deficient number, since it is larger than the sum of its proper divisors (19262103883).

210111111221 is a wasteful number, since it uses less digits than its factorization.

210111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13424491.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 210111111221 its reverse (122111111012), we get a palindrome (332222222233).

The spelling of 210111111221 in words is "two hundred ten billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".