211030021111 has 16 divisors (see below), whose sum is σ = 263287200064. Its totient is φ = 164681558784.

The previous prime is 211030021109. The next prime is 211030021151. The reversal of 211030021111 is 111120030112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211030021111 - 2¹ = 211030021109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 211030021091 and 211030021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211030021151) 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, 15876996 + ... + 15890281.

It is an arithmetic number, because the mean of its divisors is an integer number (16455450004).

Almost surely, 2^211030021111 is an apocalyptic number.

211030021111 is a deficient number, since it is larger than the sum of its proper divisors (52257178953).

211030021111 is a wasteful number, since it uses less digits than its factorization.

211030021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31767370.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 211030021111 its reverse (111120030112), we get a palindrome (322150051223).

Subtracting from 211030021111 its reverse (111120030112), we obtain a palindrome (99909990999).

The spelling of 211030021111 in words is "two hundred eleven billion, thirty million, twenty-one thousand, one hundred eleven".