1220012221111 has 4 divisors (see below), whose sum is σ = 1222729398000. Its totient is φ = 1217295044224.

The previous prime is 1220012221097. The next prime is 1220012221123. The reversal of 1220012221111 is 1111222100221.

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 1220012221111 - 2⁵ = 1220012221079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220012227111) 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, 1358587771 + ... + 1358588668.

It is an arithmetic number, because the mean of its divisors is an integer number (305682349500).

Almost surely, 2^{1220012221111} is an apocalyptic number.

1220012221111 is a deficient number, since it is larger than the sum of its proper divisors (2717176889).

1220012221111 is an equidigital number, since it uses as much as digits as its factorization.

1220012221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717176888.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220012221111 its reverse (1111222100221), we get a palindrome (2331234321332).

The spelling of 1220012221111 in words is "one trillion, two hundred twenty billion, twelve million, two hundred twenty-one thousand, one hundred eleven".