1212445321 has 4 divisors (see below), whose sum is σ = 1283765652. Its totient is φ = 1141124992.

The previous prime is 1212445307. The next prime is 1212445337. The reversal of 1212445321 is 1235442121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 458174025 + 754271296 = 21405^2 + 27464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212445321 - 2¹¹ = 1212443273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212445361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35660140 + ... + 35660173.

It is an arithmetic number, because the mean of its divisors is an integer number (320941413).

Almost surely, 2^1212445321 is an apocalyptic number.

It is an amenable number.

1212445321 is a deficient number, since it is larger than the sum of its proper divisors (71320331).

1212445321 is an equidigital number, since it uses as much as digits as its factorization.

1212445321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71320330.

The product of its digits is 1920, while the sum is 25.

The square root of 1212445321 is about 34820.1855394253. The cubic root of 1212445321 is about 1066.3195883257.

Adding to 1212445321 its reverse (1235442121), we get a palindrome (2447887442).

It can be divided in two parts, 121 and 2445321, that added together give a palindrome (2445442).

The spelling of 1212445321 in words is "one billion, two hundred twelve million, four hundred forty-five thousand, three hundred twenty-one".