21301301321 has 4 divisors (see below), whose sum is σ = 21650503044. Its totient is φ = 20952099600.

The previous prime is 21301301317. The next prime is 21301301323. The reversal of 21301301321 is 12310310312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1858903225 + 19442398096 = 43115^2 + 139436^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301301321 - 2² = 21301301317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21301301321.

It is not an unprimeable number, because it can be changed into a prime (21301301323) 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, 174600770 + ... + 174600891.

It is an arithmetic number, because the mean of its divisors is an integer number (5412625761).

Almost surely, 2^21301301321 is an apocalyptic number.

It is an amenable number.

21301301321 is a deficient number, since it is larger than the sum of its proper divisors (349201723).

21301301321 is an equidigital number, since it uses as much as digits as its factorization.

21301301321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349201722.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21301301321 its reverse (12310310312), we get a palindrome (33611611633).

The spelling of 21301301321 in words is "twenty-one billion, three hundred one million, three hundred one thousand, three hundred twenty-one".