21343203337 has 2 divisors, whose sum is σ = 21343203338. Its totient is φ = 21343203336.

The previous prime is 21343203311. The next prime is 21343203347. The reversal of 21343203337 is 73330234312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20432129481 + 911073856 = 142941^2 + 30184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343203337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21343203299 and 21343203308.

It is not a weakly prime, because it can be changed into another prime (21343203307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671601668 + 10671601669.

It is an arithmetic number, because the mean of its divisors is an integer number (10671601669).

Almost surely, 2^21343203337 is an apocalyptic number.

It is an amenable number.

21343203337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343203337 is an equidigital number, since it uses as much as digits as its factorization.

21343203337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 31.

Adding to 21343203337 its reverse (73330234312), we get a palindrome (94673437649).

The spelling of 21343203337 in words is "twenty-one billion, three hundred forty-three million, two hundred three thousand, three hundred thirty-seven".