211111022011 has 4 divisors (see below), whose sum is σ = 211111988472. Its totient is φ = 211110055552.

The previous prime is 211111021991. The next prime is 211111022077. The reversal of 211111022011 is 110220111112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211111022011 - 2²³ = 211102633403 is a prime.

It is a super-2 number, since 2×211111022011² (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 = 211111021982 and 211111022000.

It is not an unprimeable number, because it can be changed into a prime (211111022611) 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, 17115 + ... + 650011.

It is an arithmetic number, because the mean of its divisors is an integer number (52777997118).

Almost surely, 2^211111022011 is an apocalyptic number.

211111022011 is a deficient number, since it is larger than the sum of its proper divisors (966461).

211111022011 is an equidigital number, since it uses as much as digits as its factorization.

211111022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966460.

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

Adding to 211111022011 its reverse (110220111112), we get a palindrome (321331133123).

The spelling of 211111022011 in words is "two hundred eleven billion, one hundred eleven million, twenty-two thousand, eleven".