211220200111 has 4 divisors (see below), whose sum is σ = 216132297832. Its totient is φ = 206308102392.

The previous prime is 211220200013. The next prime is 211220200123. The reversal of 211220200111 is 111002022112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220200111 is a prime.

It is a super-2 number, since 2×211220200111² (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 = 211220200091 and 211220200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220200151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2456048796 + ... + 2456048881.

It is an arithmetic number, because the mean of its divisors is an integer number (54033074458).

Almost surely, 2^211220200111 is an apocalyptic number.

211220200111 is a deficient number, since it is larger than the sum of its proper divisors (4912097721).

211220200111 is an equidigital number, since it uses as much as digits as its factorization.

211220200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4912097720.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211220200111 its reverse (111002022112), we get a palindrome (322222222223).

The spelling of 211220200111 in words is "two hundred eleven billion, two hundred twenty million, two hundred thousand, one hundred eleven".