1211430321 has 12 divisors (see below), whose sum is σ = 1792523460. Its totient is φ = 787921920.

The previous prime is 1211430317. The next prime is 1211430331. The reversal of 1211430321 is 1230341121.

1211430321 is a `hidden beast` number, since 1 + 211 + 430 + 3 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 375584400 + 835845921 = 19380^2 + 28911^2 .

It is not a de Polignac number, because 1211430321 - 2² = 1211430317 is a prime.

It is a super-3 number, since 3×1211430321³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211430294 and 1211430303.

It is not an unprimeable number, because it can be changed into a prime (1211430301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1641136 + ... + 1641873.

It is an arithmetic number, because the mean of its divisors is an integer number (149376955).

Almost surely, 2^1211430321 is an apocalyptic number.

It is an amenable number.

1211430321 is a deficient number, since it is larger than the sum of its proper divisors (581093139).

1211430321 is a wasteful number, since it uses less digits than its factorization.

1211430321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283056 (or 3283053 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211430321 is about 34805.6076085449. The cubic root of 1211430321 is about 1066.0219483623.

Adding to 1211430321 its reverse (1230341121), we get a palindrome (2441771442).

The spelling of 1211430321 in words is "one billion, two hundred eleven million, four hundred thirty thousand, three hundred twenty-one".