1123222221 has 80 divisors (see below), whose sum is σ = 1972861440. Its totient is φ = 629506080.

The previous prime is 1123222211. The next prime is 1123222223. The reversal of 1123222221 is 1222223211.

It is not a de Polignac number, because 1123222221 - 2⁹ = 1123221709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1123222194 and 1123222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123222223) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 727176 + ... + 728718.

It is an arithmetic number, because the mean of its divisors is an integer number (24660768).

Almost surely, 2^1123222221 is an apocalyptic number.

1123222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1123222221 is a deficient number, since it is larger than the sum of its proper divisors (849639219).

1123222221 is a wasteful number, since it uses less digits than its factorization.

1123222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1619 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1123222221 is about 33514.5076198353. The cubic root of 1123222221 is about 1039.4937813137.

Adding to 1123222221 its reverse (1222223211), we get a palindrome (2345445432).

It can be divided in two parts, 11 and 23222221, that added together give a palindrome (23222232).

The spelling of 1123222221 in words is "one billion, one hundred twenty-three million, two hundred twenty-two thousand, two hundred twenty-one".