1222100111 has 4 divisors (see below), whose sum is σ = 1222204824. Its totient is φ = 1221995400.

The previous prime is 1222100071. The next prime is 1222100137. The reversal of 1222100111 is 1110012221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1110012221 = 113 ⋅9823117.

It is a cyclic number.

It is not a de Polignac number, because 1222100111 - 2¹⁴ = 1222083727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222100092 and 1222100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222100141) 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, 32285 + ... + 59046.

It is an arithmetic number, because the mean of its divisors is an integer number (305551206).

Almost surely, 2^1222100111 is an apocalyptic number.

1222100111 is a deficient number, since it is larger than the sum of its proper divisors (104713).

1222100111 is an equidigital number, since it uses as much as digits as its factorization.

1222100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104712.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1222100111 is about 34958.5484681501. The cubic root of 1222100111 is about 1069.1425019093.

Adding to 1222100111 its reverse (1110012221), we get a palindrome (2332112332).

The spelling of 1222100111 in words is "one billion, two hundred twenty-two million, one hundred thousand, one hundred eleven".