211211221210111 has 8 divisors (see below), whose sum is σ = 211224321009504. Its totient is φ = 211198121852160.

The previous prime is 211211221210103. The next prime is 211211221210117. The reversal of 211211221210111 is 111012122112112.

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 211211221210111 - 2³ = 211211221210103 is a prime.

It is a super-2 number, since 2×211211221210111² (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 (211211221210117) 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, 1557456670 + ... + 1557592276.

It is an arithmetic number, because the mean of its divisors is an integer number (26403040126188).

Almost surely, 2^{211211221210111} is an apocalyptic number.

211211221210111 is a deficient number, since it is larger than the sum of its proper divisors (13099799393).

211211221210111 is a wasteful number, since it uses less digits than its factorization.

211211221210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220721.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211211221210111 its reverse (111012122112112), we get a palindrome (322223343322223).

The spelling of 211211221210111 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".