1123143221 has 8 divisors (see below), whose sum is σ = 1132690944. Its totient is φ = 1113634080.

The previous prime is 1123143173. The next prime is 1123143253. The reversal of 1123143221 is 1223413211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123143221 is a prime.

It is a super-2 number, since 2×1123143221² = 2522901389756509682, 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 = 1123143193 and 1123143202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123143271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50390 + ... + 69176.

It is an arithmetic number, because the mean of its divisors is an integer number (141586368).

Almost surely, 2^1123143221 is an apocalyptic number.

It is an amenable number.

1123143221 is a deficient number, since it is larger than the sum of its proper divisors (9547723).

1123143221 is a wasteful number, since it uses less digits than its factorization.

1123143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19291.

The product of its digits is 288, while the sum is 20.

The square root of 1123143221 is about 33513.3290050392. The cubic root of 1123143221 is about 1039.4694103767.

Adding to 1123143221 its reverse (1223413211), we get a palindrome (2346556432).

The spelling of 1123143221 in words is "one billion, one hundred twenty-three million, one hundred forty-three thousand, two hundred twenty-one".