1220201111 has 4 divisors (see below), whose sum is σ = 1220300400. Its totient is φ = 1220101824.

The previous prime is 1220201089. The next prime is 1220201131. The reversal of 1220201111 is 1111020221.

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: 1111020221 = 23 ⋅48305227.

It is a cyclic number.

It is not a de Polignac number, because 1220201111 - 2¹⁰ = 1220200087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220201092 and 1220201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220201131) 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, 28091 + ... + 56828.

It is an arithmetic number, because the mean of its divisors is an integer number (305075100).

Almost surely, 2^1220201111 is an apocalyptic number.

1220201111 is a deficient number, since it is larger than the sum of its proper divisors (99289).

1220201111 is an equidigital number, since it uses as much as digits as its factorization.

1220201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99288.

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

The square root of 1220201111 is about 34931.3771701031. The cubic root of 1220201111 is about 1068.5884408799.

Adding to 1220201111 its reverse (1111020221), we get a palindrome (2331221332).

The spelling of 1220201111 in words is "one billion, two hundred twenty million, two hundred one thousand, one hundred eleven".