321016621 has 4 divisors (see below), whose sum is σ = 321121152. Its totient is φ = 320912092.

The previous prime is 321016607. The next prime is 321016667. The reversal of 321016621 is 126610123.

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 a de Polignac number, because none of the positive numbers 2^k-321016621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321016592 and 321016601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321016691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47515 + ... + 53848.

It is an arithmetic number, because the mean of its divisors is an integer number (80280288).

Almost surely, 2^321016621 is an apocalyptic number.

It is an amenable number.

321016621 is a deficient number, since it is larger than the sum of its proper divisors (104531).

321016621 is a wasteful number, since it uses less digits than its factorization.

321016621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104530.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 321016621 is about 17916.9367080425. The cubic root of 321016621 is about 684.7139452418.

Adding to 321016621 its reverse (126610123), we get a palindrome (447626744).

The spelling of 321016621 in words is "three hundred twenty-one million, sixteen thousand, six hundred twenty-one".