1220442323111 has 16 divisors (see below), whose sum is σ = 1348257184800. Its totient is φ = 1104647797440.

The previous prime is 1220442323083. The next prime is 1220442323117. The reversal of 1220442323111 is 1113232440221.

It is a happy number.

It is not a de Polignac number, because 1220442323111 - 2³⁰ = 1219368581287 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 (1220442323117) 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, 1697246 + ... + 2306843.

It is an arithmetic number, because the mean of its divisors is an integer number (84266074050).

Almost surely, 2^{1220442323111} is an apocalyptic number.

1220442323111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220442323111 is a deficient number, since it is larger than the sum of its proper divisors (127814861689).

1220442323111 is an equidigital number, since it uses as much as digits as its factorization.

1220442323111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004351 (or 4004329 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1220442323111 its reverse (1113232440221), we get a palindrome (2333674763332).

The spelling of 1220442323111 in words is "one trillion, two hundred twenty billion, four hundred forty-two million, three hundred twenty-three thousand, one hundred eleven".