1211230321 has 8 divisors (see below), whose sum is σ = 1416455744. Its totient is φ = 1014053040.

The previous prime is 1211230309. The next prime is 1211230333. The reversal of 1211230321 is 1230321121.

It is an interprime number because it is at equal distance from previous prime (1211230309) and next prime (1211230333).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211230321 - 2²³ = 1202841713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211230295 and 1211230304.

It is not an unprimeable number, because it can be changed into a prime (1211230021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2011710 + ... + 2012311.

It is an arithmetic number, because the mean of its divisors is an integer number (177056968).

Almost surely, 2^1211230321 is an apocalyptic number.

It is an amenable number.

1211230321 is a deficient number, since it is larger than the sum of its proper divisors (205225423).

1211230321 is an equidigital number, since it uses as much as digits as its factorization.

1211230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024071.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1211230321 is about 34802.7343896999. The cubic root of 1211230321 is about 1065.9632804884.

Adding to 1211230321 its reverse (1230321121), we get a palindrome (2441551442).

It can be divided in two parts, 121 and 1230321, that multiplied together give a palindrome (148868841).

The spelling of 1211230321 in words is "one billion, two hundred eleven million, two hundred thirty thousand, three hundred twenty-one".