21313234333 has 2 divisors, whose sum is σ = 21313234334. Its totient is φ = 21313234332.

The previous prime is 21313234307. The next prime is 21313234381. The reversal of 21313234333 is 33343231312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17839074969 + 3474159364 = 133563^2 + 58942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313234333 - 2⁵ = 21313234301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313234433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656617166 + 10656617167.

It is an arithmetic number, because the mean of its divisors is an integer number (10656617167).

Almost surely, 2^21313234333 is an apocalyptic number.

It is an amenable number.

21313234333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313234333 is an equidigital number, since it uses as much as digits as its factorization.

21313234333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 28.

Adding to 21313234333 its reverse (33343231312), we get a palindrome (54656465645).

The spelling of 21313234333 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-four thousand, three hundred thirty-three".