21303500401321 has 4 divisors (see below), whose sum is σ = 21303591699600. Its totient is φ = 21303409103044.

The previous prime is 21303500401243. The next prime is 21303500401357. The reversal of 21303500401321 is 12310400530312.

It is a happy number.

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 21303500401321 - 2²⁵ = 21303466846889 is a prime.

It is a super-5 number, since 5×21303500401321⁵ (a number of 68 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303500491321) 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, 45298231 + ... + 45766108.

It is an arithmetic number, because the mean of its divisors is an integer number (5325897924900).

Almost surely, 2^{21303500401321} is an apocalyptic number.

It is an amenable number.

21303500401321 is a deficient number, since it is larger than the sum of its proper divisors (91298279).

21303500401321 is an equidigital number, since it uses as much as digits as its factorization.

21303500401321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91298278.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21303500401321 its reverse (12310400530312), we get a palindrome (33613900931633).

The spelling of 21303500401321 in words is "twenty-one trillion, three hundred three billion, five hundred million, four hundred one thousand, three hundred twenty-one".