1328327621 has 2 divisors, whose sum is σ = 1328327622. Its totient is φ = 1328327620.

The previous prime is 1328327617. The next prime is 1328327633. The reversal of 1328327621 is 1267238231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194462721 + 133864900 = 34561^2 + 11570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328327621 - 2² = 1328327617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328320621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664163810 + 664163811.

It is an arithmetic number, because the mean of its divisors is an integer number (664163811).

Almost surely, 2^1328327621 is an apocalyptic number.

It is an amenable number.

1328327621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328327621 is an equidigital number, since it uses as much as digits as its factorization.

1328327621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 1328327621 is about 36446.2291739488. The cubic root of 1328327621 is about 1099.2633141791.

It can be divided in two parts, 13283 and 27621, that added together give a palindrome (40904).

The spelling of 1328327621 in words is "one billion, three hundred twenty-eight million, three hundred twenty-seven thousand, six hundred twenty-one".