21343141321 has 2 divisors, whose sum is σ = 21343141322. Its totient is φ = 21343141320.

The previous prime is 21343141301. The next prime is 21343141349. The reversal of 21343141321 is 12314134312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17191143225 + 4151998096 = 131115^2 + 64436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343141321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343141301) 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, 10671570660 + 10671570661.

It is an arithmetic number, because the mean of its divisors is an integer number (10671570661).

Almost surely, 2^21343141321 is an apocalyptic number.

It is an amenable number.

21343141321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343141321 is an equidigital number, since it uses as much as digits as its factorization.

21343141321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

Adding to 21343141321 its reverse (12314134312), we get a palindrome (33657275633).

The spelling of 21343141321 in words is "twenty-one billion, three hundred forty-three million, one hundred forty-one thousand, three hundred twenty-one".