1123212211123 has 4 divisors (see below), whose sum is σ = 1125770781520. Its totient is φ = 1120653640728.

The previous prime is 1123212211117. The next prime is 1123212211133. The reversal of 1123212211123 is 3211122123211.

It is a happy number.

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 1123212211123 - 2⁵ = 1123212211091 is a prime.

It is a super-2 number, since 2×1123212211123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123212211094 and 1123212211103.

It is not an unprimeable number, because it can be changed into a prime (1123212211133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279284540 + ... + 1279285417.

It is an arithmetic number, because the mean of its divisors is an integer number (281442695380).

Almost surely, 2^{1123212211123} is an apocalyptic number.

1123212211123 is a deficient number, since it is larger than the sum of its proper divisors (2558570397).

1123212211123 is an equidigital number, since it uses as much as digits as its factorization.

1123212211123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558570396.

The product of its digits is 288, while the sum is 22.

Adding to 1123212211123 its reverse (3211122123211), we get a palindrome (4334334334334).

The spelling of 1123212211123 in words is "one trillion, one hundred twenty-three billion, two hundred twelve million, two hundred eleven thousand, one hundred twenty-three".