21320213333 has 2 divisors, whose sum is σ = 21320213334. Its totient is φ = 21320213332.

The previous prime is 21320213311. The next prime is 21320213347. The reversal of 21320213333 is 33331202312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19064153329 + 2256060004 = 138073^2 + 47498^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320213333 - 2²² = 21316019029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320213299 and 21320213308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320213353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660106666 + 10660106667.

It is an arithmetic number, because the mean of its divisors is an integer number (10660106667).

Almost surely, 2^21320213333 is an apocalyptic number.

It is an amenable number.

21320213333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320213333 is an equidigital number, since it uses as much as digits as its factorization.

21320213333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21320213333 its reverse (33331202312), we get a palindrome (54651415645).

The spelling of 21320213333 in words is "twenty-one billion, three hundred twenty million, two hundred thirteen thousand, three hundred thirty-three".