1321632390817 has 4 divisors (see below), whose sum is σ = 1321664636160. Its totient is φ = 1321600145476.

The previous prime is 1321632390797. The next prime is 1321632390847. The reversal of 1321632390817 is 7180932361231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321632390817 - 2³⁹ = 771876576929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321632390847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16061113 + ... + 16143190.

It is an arithmetic number, because the mean of its divisors is an integer number (330416159040).

Almost surely, 2^{1321632390817} is an apocalyptic number.

It is an amenable number.

1321632390817 is a deficient number, since it is larger than the sum of its proper divisors (32245343).

1321632390817 is an equidigital number, since it uses as much as digits as its factorization.

1321632390817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32245342.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 1321632390817 in words is "one trillion, three hundred twenty-one billion, six hundred thirty-two million, three hundred ninety thousand, eight hundred seventeen".