1213421329 has 2 divisors, whose sum is σ = 1213421330. Its totient is φ = 1213421328.

The previous prime is 1213421323. The next prime is 1213421357. The reversal of 1213421329 is 9231243121.

It is a happy number.

It is an a-pointer prime, because the next prime (1213421357) can be obtained adding 1213421329 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193840704 + 19580625 = 34552^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213421329 - 2¹³ = 1213413137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213421297 and 1213421306.

It is not a weakly prime, because it can be changed into another prime (1213421323) 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 as a sum of consecutive naturals, namely, 606710664 + 606710665.

It is an arithmetic number, because the mean of its divisors is an integer number (606710665).

Almost surely, 2^1213421329 is an apocalyptic number.

It is an amenable number.

1213421329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213421329 is an equidigital number, since it uses as much as digits as its factorization.

1213421329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1213421329 is about 34834.1976942200. The cubic root of 1213421329 is about 1066.6056375999.

The spelling of 1213421329 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, three hundred twenty-nine".