1220211111 has 16 divisors (see below), whose sum is σ = 1940212224. Its totient is φ = 666947424.

The previous prime is 1220211077. The next prime is 1220211151. The reversal of 1220211111 is 1111120221.

It is not a de Polignac number, because 1220211111 - 2¹⁵ = 1220178343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211151) 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 15 ways as a sum of consecutive naturals, for example, 1262676 + ... + 1263641.

It is an arithmetic number, because the mean of its divisors is an integer number (121263264).

Almost surely, 2^1220211111 is an apocalyptic number.

1220211111 is a deficient number, since it is larger than the sum of its proper divisors (720001113).

1220211111 is a wasteful number, since it uses less digits than its factorization.

1220211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526350.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1220211111 is about 34931.5203075961. The cubic root of 1220211111 is about 1068.5913600313.

Adding to 1220211111 its reverse (1111120221), we get a palindrome (2331331332).

The spelling of 1220211111 in words is "one billion, two hundred twenty million, two hundred eleven thousand, one hundred eleven".