1011220111 has 12 divisors (see below), whose sum is σ = 1149838200. Its totient is φ = 887588240.

The previous prime is 1011220097. The next prime is 1011220123. The reversal of 1011220111 is 1110221101.

It is not a de Polignac number, because 1011220111 - 2⁷ = 1011219983 is a prime.

It is a super-2 number, since 2×1011220111² = 2045132225781704642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011220151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140581 + ... + 147598.

It is an arithmetic number, because the mean of its divisors is an integer number (95819850).

Almost surely, 2^1011220111 is an apocalyptic number.

1011220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011220111 is a deficient number, since it is larger than the sum of its proper divisors (138618089).

1011220111 is a wasteful number, since it uses less digits than its factorization.

1011220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288230 (or 288219 counting only the distinct ones).

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

The square root of 1011220111 is about 31799.6872783366. The cubic root of 1011220111 is about 1003.7261356683.

Adding to 1011220111 its reverse (1110221101), we get a palindrome (2121441212).

It can be divided in two parts, 1011 and 220111, that added together give a palindrome (221122).

The spelling of 1011220111 in words is "one billion, eleven million, two hundred twenty thousand, one hundred eleven".