21023131312333 has 2 divisors, whose sum is σ = 21023131312334. Its totient is φ = 21023131312332.

The previous prime is 21023131312321. The next prime is 21023131312361. The reversal of 21023131312333 is 33321313132012.

It is a happy number.

It is an a-pointer prime, because the next prime (21023131312361) can be obtained adding 21023131312333 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18625629010564 + 2397502301769 = 4315742^2 + 1548387^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023131312333 - 2²⁵ = 21023097757901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023131312133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511565656166 + 10511565656167.

It is an arithmetic number, because the mean of its divisors is an integer number (10511565656167).

Almost surely, 2^{21023131312333} is an apocalyptic number.

It is an amenable number.

21023131312333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023131312333 is an equidigital number, since it uses as much as digits as its factorization.

21023131312333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21023131312333 its reverse (33321313132012), we get a palindrome (54344444444345).

The spelling of 21023131312333 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-one million, three hundred twelve thousand, three hundred thirty-three".