21220123321 has 8 divisors (see below), whose sum is σ = 21285704384. Its totient is φ = 21154644720.

The previous prime is 21220123291. The next prime is 21220123409. The reversal of 21220123321 is 12332102212.

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 21220123321 - 2⁵ = 21220123289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220123021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400060 + ... + 449986.

It is an arithmetic number, because the mean of its divisors is an integer number (2660713048).

Almost surely, 2^21220123321 is an apocalyptic number.

It is an amenable number.

21220123321 is a deficient number, since it is larger than the sum of its proper divisors (65581063).

21220123321 is an equidigital number, since it uses as much as digits as its factorization.

21220123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51231.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21220123321 its reverse (12332102212), we get a palindrome (33552225533).

The spelling of 21220123321 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-three thousand, three hundred twenty-one".