1211104111 has 4 divisors (see below), whose sum is σ = 1384118992. Its totient is φ = 1038089232.

The previous prime is 1211104093. The next prime is 1211104121. The reversal of 1211104111 is 1114011121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211104111 - 2⁹ = 1211103599 is a prime.

It is a super-2 number, since 2×1211104111² = 2933546335362200642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211104091 and 1211104100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211104121) 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, 86507430 + ... + 86507443.

It is an arithmetic number, because the mean of its divisors is an integer number (346029748).

Almost surely, 2^1211104111 is an apocalyptic number.

1211104111 is a deficient number, since it is larger than the sum of its proper divisors (173014881).

1211104111 is an equidigital number, since it uses as much as digits as its factorization.

1211104111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173014880.

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

The square root of 1211104111 is about 34800.9211228668. The cubic root of 1211104111 is about 1065.9262548029.

Adding to 1211104111 its reverse (1114011121), we get a palindrome (2325115232).

The spelling of 1211104111 in words is "one billion, two hundred eleven million, one hundred four thousand, one hundred eleven".