321620336639 has 16 divisors (see below), whose sum is σ = 379457734656. Its totient is φ = 266757472800.

The previous prime is 321620336633. The next prime is 321620336657. The reversal of 321620336639 is 936633026123.

It is not a de Polignac number, because 321620336639 - 2⁴ = 321620336623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321620336639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321620336633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2544689 + ... + 2668085.

It is an arithmetic number, because the mean of its divisors is an integer number (23716108416).

Almost surely, 2^321620336639 is an apocalyptic number.

321620336639 is a deficient number, since it is larger than the sum of its proper divisors (57837398017).

321620336639 is a wasteful number, since it uses less digits than its factorization.

321620336639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135446.

The product of its (nonzero) digits is 629856, while the sum is 44.

The spelling of 321620336639 in words is "three hundred twenty-one billion, six hundred twenty million, three hundred thirty-six thousand, six hundred thirty-nine".