1230203221 has 6 divisors (see below), whose sum is σ = 1332113730. Its totient is φ = 1135572048.

The previous prime is 1230203209. The next prime is 1230203291. The reversal of 1230203221 is 1223020321.

It can be written as a sum of positive squares in 3 ways, for example, as 4223025 + 1225980196 = 2055^2 + 35014^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1230203221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1230203195 and 1230203204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230203201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3639486 + ... + 3639823.

It is an arithmetic number, because the mean of its divisors is an integer number (222018955).

Almost surely, 2^1230203221 is an apocalyptic number.

It is an amenable number.

1230203221 is a deficient number, since it is larger than the sum of its proper divisors (101910509).

1230203221 is an equidigital number, since it uses as much as digits as its factorization.

1230203221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7279335 (or 7279322 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1230203221 is about 35074.2529642472. The cubic root of 1230203221 is about 1071.5002743996.

Adding to 1230203221 its reverse (1223020321), we get a palindrome (2453223542).

The spelling of 1230203221 in words is "one billion, two hundred thirty million, two hundred three thousand, two hundred twenty-one".