321220266491 has 8 divisors (see below), whose sum is σ = 324099879600. Its totient is φ = 318348777600.

The previous prime is 321220266487. The next prime is 321220266503. The reversal of 321220266491 is 194662022123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321220266491 - 2² = 321220266487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321220266421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951610 + ... + 2109791.

It is an arithmetic number, because the mean of its divisors is an integer number (40512484950).

Almost surely, 2^321220266491 is an apocalyptic number.

321220266491 is a deficient number, since it is larger than the sum of its proper divisors (2879613109).

321220266491 is a wasteful number, since it uses less digits than its factorization.

321220266491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062109.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 321220266491 in words is "three hundred twenty-one billion, two hundred twenty million, two hundred sixty-six thousand, four hundred ninety-one".