221320322321 has 8 divisors (see below), whose sum is σ = 259773660480. Its totient is φ = 184576021488.

The previous prime is 221320322317. The next prime is 221320322329. The reversal of 221320322321 is 123223023122.

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 221320322321 - 2² = 221320322317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221320322329) 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, 427259051 + ... + 427259568.

It is an arithmetic number, because the mean of its divisors is an integer number (32471707560).

Almost surely, 2^221320322321 is an apocalyptic number.

It is an amenable number.

221320322321 is a deficient number, since it is larger than the sum of its proper divisors (38453338159).

221320322321 is an equidigital number, since it uses as much as digits as its factorization.

221320322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854518663.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 221320322321 its reverse (123223023122), we get a palindrome (344543345443).

The spelling of 221320322321 in words is "two hundred twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, three hundred twenty-one".