321680358403 has 2 divisors, whose sum is σ = 321680358404. Its totient is φ = 321680358402.

The previous prime is 321680358347. The next prime is 321680358413. The reversal of 321680358403 is 304853086123.

It is a strong prime.

It is an emirp because it is prime and its reverse (304853086123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321680358403 - 2²¹ = 321678261251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321680358403.

It is not a weakly prime, because it can be changed into another prime (321680358413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160840179201 + 160840179202.

It is an arithmetic number, because the mean of its divisors is an integer number (160840179202).

Almost surely, 2^321680358403 is an apocalyptic number.

321680358403 is a deficient number, since it is larger than the sum of its proper divisors (1).

321680358403 is an equidigital number, since it uses as much as digits as its factorization.

321680358403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 321680358403 in words is "three hundred twenty-one billion, six hundred eighty million, three hundred fifty-eight thousand, four hundred three".