211100121111 has 16 divisors (see below), whose sum is σ = 325116764928. Its totient is φ = 120413616000.

The previous prime is 211100121107. The next prime is 211100121119. The reversal of 211100121111 is 111121001112.

It is not a de Polignac number, because 211100121111 - 2² = 211100121107 is a prime.

It is a super-2 number, since 2×211100121111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100121119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188145715 + ... + 188146836.

It is an arithmetic number, because the mean of its divisors is an integer number (20319797808).

Almost surely, 2^211100121111 is an apocalyptic number.

211100121111 is a deficient number, since it is larger than the sum of its proper divisors (114016643817).

211100121111 is a wasteful number, since it uses less digits than its factorization.

211100121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376292582.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 211100121111 its reverse (111121001112), we get a palindrome (322221122223).

The spelling of 211100121111 in words is "two hundred eleven billion, one hundred million, one hundred twenty-one thousand, one hundred eleven".