211112121211 has 4 divisors (see below), whose sum is σ = 211127056000. Its totient is φ = 211097186424.

The previous prime is 211112121197. The next prime is 211112121223. The reversal of 211112121211 is 112121211112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211112121211 - 2⁹ = 211112120699 is a prime.

It is a super-2 number, since 2×211112121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211112121271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7446171 + ... + 7474468.

It is an arithmetic number, because the mean of its divisors is an integer number (52781764000).

Almost surely, 2^211112121211 is an apocalyptic number.

211112121211 is a deficient number, since it is larger than the sum of its proper divisors (14934789).

211112121211 is a wasteful number, since it uses less digits than its factorization.

211112121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934788.

The product of its digits is 16, while the sum is 16.

Adding to 211112121211 its reverse (112121211112), we get a palindrome (323233332323).

The spelling of 211112121211 in words is "two hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, two hundred eleven".