1220220111 has 16 divisors (see below), whose sum is σ = 1775468160. Its totient is φ = 739276320.

The previous prime is 1220220083. The next prime is 1220220137. The reversal of 1220220111 is 1110220221.

It is not a de Polignac number, because 1220220111 - 2⁹ = 1220219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151945 + ... + 159773.

It is an arithmetic number, because the mean of its divisors is an integer number (110966760).

Almost surely, 2^1220220111 is an apocalyptic number.

1220220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220220111 is a deficient number, since it is larger than the sum of its proper divisors (555248049).

1220220111 is a wasteful number, since it uses less digits than its factorization.

1220220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12566.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220220111 is about 34931.6491308384. The cubic root of 1220220111 is about 1068.5939872539.

Adding to 1220220111 its reverse (1110220221), we get a palindrome (2330440332).

The spelling of 1220220111 in words is "one billion, two hundred twenty million, two hundred twenty thousand, one hundred eleven".