1220111011 has 16 divisors (see below), whose sum is σ = 1481286400. Its totient is φ = 981665568.

The previous prime is 1220110999. The next prime is 1220111017. The reversal of 1220111011 is 1101110221.

It is a cyclic number.

It is not a de Polignac number, because 1220111011 - 2⁵ = 1220110979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220111017) 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, 27585 + ... + 56578.

It is an arithmetic number, because the mean of its divisors is an integer number (92580400).

Almost surely, 2^1220111011 is an apocalyptic number.

1220111011 is a deficient number, since it is larger than the sum of its proper divisors (261175389).

1220111011 is a wasteful number, since it uses less digits than its factorization.

1220111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84298.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1220111011 is about 34930.0874748404. The cubic root of 1220111011 is about 1068.5621386069.

Adding to 1220111011 its reverse (1101110221), we get a palindrome (2321221232).

The spelling of 1220111011 in words is "one billion, two hundred twenty million, one hundred eleven thousand, eleven".