21320120003321 has 8 divisors (see below), whose sum is σ = 21722610809160. Its totient is φ = 20917637508352.

The previous prime is 21320120003257. The next prime is 21320120003423. The reversal of 21320120003321 is 12330002102312.

It can be written as a sum of positive squares in 4 ways, for example, as 280835343721 + 21039284659600 = 529939^2 + 4586860^2 .

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 21320120003321 - 2⁶ = 21320120003257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320120003293 and 21320120003302.

It is not an unprimeable number, because it can be changed into a prime (21320120003821) 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, 3228065 + ... + 7284273.

It is an arithmetic number, because the mean of its divisors is an integer number (2715326351145).

Almost surely, 2^{21320120003321} is an apocalyptic number.

It is an amenable number.

21320120003321 is a deficient number, since it is larger than the sum of its proper divisors (402490805839).

21320120003321 is an equidigital number, since it uses as much as digits as its factorization.

21320120003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155435.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21320120003321 its reverse (12330002102312), we get a palindrome (33650122105633).

The spelling of 21320120003321 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty million, three thousand, three hundred twenty-one".