21321313301 has 2 divisors, whose sum is σ = 21321313302. Its totient is φ = 21321313300.

The previous prime is 21321313297. The next prime is 21321313309. The reversal of 21321313301 is 10331312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19161480625 + 2159832676 = 138425^2 + 46474^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321313301 - 2² = 21321313297 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321313309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660656650 + 10660656651.

It is an arithmetic number, because the mean of its divisors is an integer number (10660656651).

Almost surely, 2^21321313301 is an apocalyptic number.

It is an amenable number.

21321313301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321313301 is an equidigital number, since it uses as much as digits as its factorization.

21321313301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21321313301 its reverse (10331312312), we get a palindrome (31652625613).

The spelling of 21321313301 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, three hundred one".