1123203321221 has 4 divisors (see below), whose sum is σ = 1124082886572. Its totient is φ = 1122323755872.

The previous prime is 1123203321199. The next prime is 1123203321223. The reversal of 1123203321221 is 1221233023211.

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 529240245121 + 593963076100 = 727489^2 + 770690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123203321221 - 2³⁰ = 1122129579397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123203321223) 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, 439780760 + ... + 439783313.

It is an arithmetic number, because the mean of its divisors is an integer number (281020721643).

Almost surely, 2^{1123203321221} is an apocalyptic number.

It is an amenable number.

1123203321221 is a deficient number, since it is larger than the sum of its proper divisors (879565351).

1123203321221 is an equidigital number, since it uses as much as digits as its factorization.

1123203321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879565350.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1123203321221 its reverse (1221233023211), we get a palindrome (2344436344432).

The spelling of 1123203321221 in words is "one trillion, one hundred twenty-three billion, two hundred three million, three hundred twenty-one thousand, two hundred twenty-one".