1220111112111 has 16 divisors (see below), whose sum is σ = 1671486041184. Its totient is φ = 791090302464.

The previous prime is 1220111112107. The next prime is 1220111112131. The reversal of 1220111112111 is 1112111110221.

It is not a de Polignac number, because 1220111112111 - 2² = 1220111112107 is a prime.

It is a super-2 number, since 2×1220111112111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220111112131) 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 15 ways as a sum of consecutive naturals, for example, 2048310 + ... + 2576003.

It is an arithmetic number, because the mean of its divisors is an integer number (104467877574).

Almost surely, 2^{1220111112111} is an apocalyptic number.

1220111112111 is a deficient number, since it is larger than the sum of its proper divisors (451374929073).

1220111112111 is a wasteful number, since it uses less digits than its factorization.

1220111112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626730.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1220111112111 its reverse (1112111110221), we get a palindrome (2332222222332).

The spelling of 1220111112111 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred twelve thousand, one hundred eleven".