1328238151621 has 16 divisors (see below), whose sum is σ = 1346807973888. Its totient is φ = 1309799332800.

The previous prime is 1328238151613. The next prime is 1328238151627. The reversal of 1328238151621 is 1261518328231.

It is a cyclic number.

It is not a de Polignac number, because 1328238151621 - 2³ = 1328238151613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328238151627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115583686 + ... + 115595176.

It is an arithmetic number, because the mean of its divisors is an integer number (84175498368).

Almost surely, 2^{1328238151621} is an apocalyptic number.

It is an amenable number.

1328238151621 is a deficient number, since it is larger than the sum of its proper divisors (18569822267).

1328238151621 is a wasteful number, since it uses less digits than its factorization.

1328238151621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17052.

The product of its digits is 138240, while the sum is 43.

The spelling of 1328238151621 in words is "one trillion, three hundred twenty-eight billion, two hundred thirty-eight million, one hundred fifty-one thousand, six hundred twenty-one".