211111111002111 has 16 divisors (see below), whose sum is σ = 299867676989184. Its totient is φ = 131649224033664.

The previous prime is 211111111002091. The next prime is 211111111002203. The reversal of 211111111002111 is 111200111111112.

It is a happy number.

It is not a de Polignac number, because 211111111002111 - 2⁹ = 211111111001599 is a prime.

It is a super-2 number, since 2×211111111002111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111111006111) 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, 12697640611 + ... + 12697657236.

It is an arithmetic number, because the mean of its divisors is an integer number (18741729811824).

Almost surely, 2^{211111111002111} is an apocalyptic number.

211111111002111 is a deficient number, since it is larger than the sum of its proper divisors (88756565987073).

211111111002111 is a wasteful number, since it uses less digits than its factorization.

211111111002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25395298030.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 211111111002111 its reverse (111200111111112), we get a palindrome (322311222113223).

The spelling of 211111111002111 in words is "two hundred eleven trillion, one hundred eleven billion, one hundred eleven million, two thousand, one hundred eleven".