1212330401 has 4 divisors (see below), whose sum is σ = 1283643972. Its totient is φ = 1141016832.

The previous prime is 1212330389. The next prime is 1212330421. The reversal of 1212330401 is 1040332121.

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 661724176 + 550606225 = 25724^2 + 23465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212330401 - 2⁶ = 1212330337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71313553 = 1212330401 / (1 + 2 + 1 + 2 + 3 + 3 + 0 + 4 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212330401.

It is not an unprimeable number, because it can be changed into a prime (1212330421) 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, 35656760 + ... + 35656793.

It is an arithmetic number, because the mean of its divisors is an integer number (320910993).

Almost surely, 2^1212330401 is an apocalyptic number.

It is an amenable number.

1212330401 is a deficient number, since it is larger than the sum of its proper divisors (71313571).

1212330401 is an equidigital number, since it uses as much as digits as its factorization.

1212330401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71313570.

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

The square root of 1212330401 is about 34818.5353080798. The cubic root of 1212330401 is about 1066.2858973716.

Adding to 1212330401 its reverse (1040332121), we get a palindrome (2252662522).

It can be divided in two parts, 12123 and 30401, that added together give a palindrome (42524).

The spelling of 1212330401 in words is "one billion, two hundred twelve million, three hundred thirty thousand, four hundred one".