1221230213 has 16 divisors (see below), whose sum is σ = 1460468736. Its totient is φ = 999112320.

The previous prime is 1221230189. The next prime is 1221230221. The reversal of 1221230213 is 3120321221.

It is a cyclic number.

It is not a de Polignac number, because 1221230213 - 2¹⁰ = 1221229189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221230191 and 1221230200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221230273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22706 + ... + 54387.

It is an arithmetic number, because the mean of its divisors is an integer number (91279296).

Almost surely, 2^1221230213 is an apocalyptic number.

It is an amenable number.

1221230213 is a deficient number, since it is larger than the sum of its proper divisors (239238523).

1221230213 is an equidigital number, since it uses as much as digits as its factorization.

1221230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77204.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221230213 is about 34946.1044037815. The cubic root of 1221230213 is about 1068.8887677366. Note that the first 3 decimals are identical.

Adding to 1221230213 its reverse (3120321221), we get a palindrome (4341551434).

The spelling of 1221230213 in words is "one billion, two hundred twenty-one million, two hundred thirty thousand, two hundred thirteen".