1123143421 has 4 divisors (see below), whose sum is σ = 1135763100. Its totient is φ = 1110523744.

The previous prime is 1123143397. The next prime is 1123143433. The reversal of 1123143421 is 1243413211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66243321 + 1056900100 = 8139^2 + 32510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123143421 - 2¹¹ = 1123141373 is a prime.

It is a super-2 number, since 2×1123143421² = 2522902288271166482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123143392 and 1123143401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123143451) 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, 6309706 + ... + 6309883.

It is an arithmetic number, because the mean of its divisors is an integer number (283940775).

Almost surely, 2^1123143421 is an apocalyptic number.

It is an amenable number.

1123143421 is a deficient number, since it is larger than the sum of its proper divisors (12619679).

1123143421 is an equidigital number, since it uses as much as digits as its factorization.

1123143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12619678.

The product of its digits is 576, while the sum is 22.

The square root of 1123143421 is about 33513.3319889264. The cubic root of 1123143421 is about 1039.4694720767.

Adding to 1123143421 its reverse (1243413211), we get a palindrome (2366556632).

The spelling of 1123143421 in words is "one billion, one hundred twenty-three million, one hundred forty-three thousand, four hundred twenty-one".