21210330311323 has 2 divisors, whose sum is σ = 21210330311324. Its totient is φ = 21210330311322.

The previous prime is 21210330311243. The next prime is 21210330311341. The reversal of 21210330311323 is 32311303301212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210330311323 - 2²⁹ = 21209793440411 is a prime.

It is a super-2 number, since 2×21210330311323² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21210330311393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605165155661 + 10605165155662.

It is an arithmetic number, because the mean of its divisors is an integer number (10605165155662).

Almost surely, 2^{21210330311323} is an apocalyptic number.

21210330311323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210330311323 is an equidigital number, since it uses as much as digits as its factorization.

21210330311323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21210330311323 its reverse (32311303301212), we get a palindrome (53521633612535).

The spelling of 21210330311323 in words is "twenty-one trillion, two hundred ten billion, three hundred thirty million, three hundred eleven thousand, three hundred twenty-three".