211002121111 has 4 divisors (see below), whose sum is σ = 211035785400. Its totient is φ = 210968456824.

The previous prime is 211002121093. The next prime is 211002121117. The reversal of 211002121111 is 111121200112.

It is a happy number.

211002121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211002121111 - 2¹¹ = 211002119063 is a prime.

It is a super-2 number, since 2×211002121111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211002121091 and 211002121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211002121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16822741 + ... + 16835278.

It is an arithmetic number, because the mean of its divisors is an integer number (52758946350).

Almost surely, 2^211002121111 is an apocalyptic number.

211002121111 is a deficient number, since it is larger than the sum of its proper divisors (33664289).

211002121111 is an equidigital number, since it uses as much as digits as its factorization.

211002121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33664288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211002121111 its reverse (111121200112), we get a palindrome (322123321223).

The spelling of 211002121111 in words is "two hundred eleven billion, two million, one hundred twenty-one thousand, one hundred eleven".