21310213333 has 2 divisors, whose sum is σ = 21310213334. Its totient is φ = 21310213332.

The previous prime is 21310213321. The next prime is 21310213343. The reversal of 21310213333 is 33331201312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21287393604 + 22819729 = 145902^2 + 4777^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310213333 - 2⁹ = 21310212821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310213313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655106666 + 10655106667.

It is an arithmetic number, because the mean of its divisors is an integer number (10655106667).

Almost surely, 2^21310213333 is an apocalyptic number.

It is an amenable number.

21310213333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310213333 is an equidigital number, since it uses as much as digits as its factorization.

21310213333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21310213333 its reverse (33331201312), we get a palindrome (54641414645).

The spelling of 21310213333 in words is "twenty-one billion, three hundred ten million, two hundred thirteen thousand, three hundred thirty-three".