321001386961 has 4 divisors (see below), whose sum is σ = 328830689124. Its totient is φ = 313172084800.

The previous prime is 321001386949. The next prime is 321001386997. The reversal of 321001386961 is 169683100123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169683100123 = 1487 ⋅114111029.

It can be written as a sum of positive squares in 2 ways, for example, as 118969116561 + 202032270400 = 344919^2 + 449480^2 .

It is a cyclic number.

It is not a de Polignac number, because 321001386961 - 2²⁹ = 320464516049 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321001386931) 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, 3914651020 + ... + 3914651101.

It is an arithmetic number, because the mean of its divisors is an integer number (82207672281).

Almost surely, 2^321001386961 is an apocalyptic number.

It is an amenable number.

321001386961 is a deficient number, since it is larger than the sum of its proper divisors (7829302163).

321001386961 is an equidigital number, since it uses as much as digits as its factorization.

321001386961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7829302162.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 321001386961 in words is "three hundred twenty-one billion, one million, three hundred eighty-six thousand, nine hundred sixty-one".