21313332013 has 2 divisors, whose sum is σ = 21313332014. Its totient is φ = 21313332012.

The previous prime is 21313331957. The next prime is 21313332031. The reversal of 21313332013 is 31023331312.

Together with next prime (21313332031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21312204169 + 1127844 = 145987^2 + 1062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313332013 - 2¹³ = 21313323821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313332083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656666006 + 10656666007.

It is an arithmetic number, because the mean of its divisors is an integer number (10656666007).

Almost surely, 2^21313332013 is an apocalyptic number.

It is an amenable number.

21313332013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313332013 is an equidigital number, since it uses as much as digits as its factorization.

21313332013 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21313332013 its reverse (31023331312), we get a palindrome (52336663325).

The spelling of 21313332013 in words is "twenty-one billion, three hundred thirteen million, three hundred thirty-two thousand, thirteen".