1223330021 has 4 divisors (see below), whose sum is σ = 1223646252. Its totient is φ = 1223013792.

The previous prime is 1223330011. The next prime is 1223330041. The reversal of 1223330021 is 1200333221.

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 909685921 + 313644100 = 30161^2 + 17710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223330021 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 (1223330011) 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, 152240 + ... + 160073.

It is an arithmetic number, because the mean of its divisors is an integer number (305911563).

Almost surely, 2^1223330021 is an apocalyptic number.

It is an amenable number.

1223330021 is a deficient number, since it is larger than the sum of its proper divisors (316231).

1223330021 is an equidigital number, since it uses as much as digits as its factorization.

1223330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316230.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1223330021 is about 34976.1350208967. The cubic root of 1223330021 is about 1069.5010399625.

Adding to 1223330021 its reverse (1200333221), we get a palindrome (2423663242).

The spelling of 1223330021 in words is "one billion, two hundred twenty-three million, three hundred thirty thousand, twenty-one".