1211000220111 has 16 divisors (see below), whose sum is σ = 1763967673728. Its totient is φ = 732892524000.

The previous prime is 1211000220077. The next prime is 1211000220119. The reversal of 1211000220111 is 1110220001121.

It is not a de Polignac number, because 1211000220111 - 2¹³ = 1211000211919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000220119) 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, 26151601 + ... + 26197866.

It is an arithmetic number, because the mean of its divisors is an integer number (110247979608).

Almost surely, 2^{1211000220111} is an apocalyptic number.

1211000220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211000220111 is a deficient number, since it is larger than the sum of its proper divisors (552967453617).

1211000220111 is a wasteful number, since it uses less digits than its factorization.

1211000220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52350182.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211000220111 its reverse (1110220001121), we get a palindrome (2321220221232).

The spelling of 1211000220111 in words is "one trillion, two hundred eleven billion, two hundred twenty thousand, one hundred eleven".