211220110111 has 2 divisors, whose sum is σ = 211220110112. Its totient is φ = 211220110110.

The previous prime is 211220110097. The next prime is 211220110139. The reversal of 211220110111 is 111011022112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211220110111 - 2¹⁷ = 211219979039 is a prime.

It is a super-2 number, since 2×211220110111² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220110091 and 211220110100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220111111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610055055 + 105610055056.

It is an arithmetic number, because the mean of its divisors is an integer number (105610055056).

Almost surely, 2^211220110111 is an apocalyptic number.

211220110111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220110111 is an equidigital number, since it uses as much as digits as its factorization.

211220110111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 211220110111 its reverse (111011022112), we get a palindrome (322231132223).

The spelling of 211220110111 in words is "two hundred eleven billion, two hundred twenty million, one hundred ten thousand, one hundred eleven".