1220111121111 has 4 divisors (see below), whose sum is σ = 1626814828152. Its totient is φ = 813407414072.

The previous prime is 1220111121107. The next prime is 1220111121121. The reversal of 1220111121111 is 1111211110221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220111121111 - 2² = 1220111121107 is a prime.

It is a super-2 number, since 2×1220111121111² (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 (1220111121101) 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 3 ways as a sum of consecutive naturals, for example, 203351853516 + ... + 203351853521.

It is an arithmetic number, because the mean of its divisors is an integer number (406703707038).

Almost surely, 2^{1220111121111} is an apocalyptic number.

1220111121111 is a deficient number, since it is larger than the sum of its proper divisors (406703707041).

1220111121111 is an equidigital number, since it uses as much as digits as its factorization.

1220111121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406703707040.

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

Adding to 1220111121111 its reverse (1111211110221), we get a palindrome (2331322231332).

The spelling of 1220111121111 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".