1220221111111 has 4 divisors (see below), whose sum is σ = 1220265204424. Its totient is φ = 1220177017800.

The previous prime is 1220221111097. The next prime is 1220221111133. The reversal of 1220221111111 is 1111111220221.

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 1220221111111 - 2¹⁵ = 1220221078343 is a prime.

It is a Duffinian number.

1220221111111 is a modest number, since divided by 1111111 gives 122022 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221111411) 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, 22005120 + ... + 22060501.

It is an arithmetic number, because the mean of its divisors is an integer number (305066301106).

Almost surely, 2^{1220221111111} is an apocalyptic number.

1220221111111 is a deficient number, since it is larger than the sum of its proper divisors (44093313).

1220221111111 is an equidigital number, since it uses as much as digits as its factorization.

1220221111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44093312.

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

Adding to 1220221111111 its reverse (1111111220221), we get a palindrome (2331332331332).

It can be divided in two parts, 1220221 and 111111, that multiplied together give a palindrome (135579975531).

The spelling of 1220221111111 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eleven".