321221020320209 has 4 divisors (see below), whose sum is σ = 328055510114304. Its totient is φ = 314386530526116.

The previous prime is 321221020320181. The next prime is 321221020320257. The reversal of 321221020320209 is 902023020122123.

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 321221020320209 - 2¹² = 321221020316113 is a prime.

It is a super-2 number, since 2×321221020320209² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221020326209) 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, 3417244896977 + ... + 3417244897070.

It is an arithmetic number, because the mean of its divisors is an integer number (82013877528576).

Almost surely, 2^{321221020320209} is an apocalyptic number.

It is an amenable number.

321221020320209 is a deficient number, since it is larger than the sum of its proper divisors (6834489794095).

321221020320209 is an equidigital number, since it uses as much as digits as its factorization.

321221020320209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834489794094.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 321221020320209 in words is "three hundred twenty-one trillion, two hundred twenty-one billion, twenty million, three hundred twenty thousand, two hundred nine".