1212352321 has 4 divisors (see below), whose sum is σ = 1213462612. Its totient is φ = 1211242032.

The previous prime is 1212352313. The next prime is 1212352367. The reversal of 1212352321 is 1232532121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232532121 = 12893 ⋅95597.

It can be written as a sum of positive squares in 2 ways, for example, as 602015296 + 610337025 = 24536^2 + 24705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212352321 - 2³ = 1212352313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212352292 and 1212352301.

It is not an unprimeable number, because it can be changed into a prime (1212352021) 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, 553506 + ... + 555691.

It is an arithmetic number, because the mean of its divisors is an integer number (303365653).

Almost surely, 2^1212352321 is an apocalyptic number.

It is an amenable number.

1212352321 is a deficient number, since it is larger than the sum of its proper divisors (1110291).

1212352321 is a wasteful number, since it uses less digits than its factorization.

1212352321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110290.

The product of its digits is 720, while the sum is 22.

The square root of 1212352321 is about 34818.8500815291. The cubic root of 1212352321 is about 1066.2923237951.

Adding to 1212352321 its reverse (1232532121), we get a palindrome (2444884442).

The spelling of 1212352321 in words is "one billion, two hundred twelve million, three hundred fifty-two thousand, three hundred twenty-one".