1211220110111 has 8 divisors (see below), whose sum is σ = 1321361613648. Its totient is φ = 1101083704000.

The previous prime is 1211220110069. The next prime is 1211220110129. The reversal of 1211220110111 is 1110110221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211220110111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768800 + ... + 1735941.

It is an arithmetic number, because the mean of its divisors is an integer number (165170201706).

Almost surely, 2^{1211220110111} is an apocalyptic number.

1211220110111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211220110111 is a deficient number, since it is larger than the sum of its proper divisors (110141503537).

1211220110111 is a wasteful number, since it uses less digits than its factorization.

1211220110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548713.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211220110111 its reverse (1110110221121), we get a palindrome (2321330331232).

The spelling of 1211220110111 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred ten thousand, one hundred eleven".