1211221111118 has 16 divisors (see below), whose sum is σ = 1923732658224. Its totient is φ = 569977948800.

The previous prime is 1211221111117. The next prime is 1211221111151. The reversal of 1211221111118 is 8111111221121.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211221111093 and 1211221111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221111117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2471621 + ... + 2920847.

It is an arithmetic number, because the mean of its divisors is an integer number (120233291139).

Almost surely, 2^{1211221111118} is an apocalyptic number.

1211221111118 is a deficient number, since it is larger than the sum of its proper divisors (712511547106).

1211221111118 is a wasteful number, since it uses less digits than its factorization.

1211221111118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528547.

The product of its digits is 64, while the sum is 23.

Adding to 1211221111118 its reverse (8111111221121), we get a palindrome (9322332332239).

The spelling of 1211221111118 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eighteen".