1111221111123 has 16 divisors (see below), whose sum is σ = 1646284726560. Its totient is φ = 740800021248.

The previous prime is 1111221111097. The next prime is 1111221111151. The reversal of 1111221111123 is 3211111221111.

It is not a de Polignac number, because 1111221111123 - 2¹⁶ = 1111221045587 is a prime.

It is a super-2 number, since 2×1111221111123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111221111096 and 1111221111105.

It is not an unprimeable number, because it can be changed into a prime (1111221111163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173211 + ... + 1897067.

It is an arithmetic number, because the mean of its divisors is an integer number (102892795410).

Almost surely, 2^{1111221111123} is an apocalyptic number.

1111221111123 is a deficient number, since it is larger than the sum of its proper divisors (535063615437).

1111221111123 is an equidigital number, since it uses as much as digits as its factorization.

1111221111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780723 (or 780717 counting only the distinct ones).

The product of its digits is 24, while the sum is 18.

Adding to 1111221111123 its reverse (3211111221111), we get a palindrome (4322332332234).

The spelling of 1111221111123 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".