21011213323 has 2 divisors, whose sum is σ = 21011213324. Its totient is φ = 21011213322.

The previous prime is 21011213317. The next prime is 21011213329. The reversal of 21011213323 is 32331211012.

It is a balanced prime because it is at equal distance from previous prime (21011213317) and next prime (21011213329).

It is a cyclic number.

It is not a de Polignac number, because 21011213323 - 2⁹ = 21011212811 is a prime.

It is a super-2 number, since 2×21011213323² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011213323.

It is not a weakly prime, because it can be changed into another prime (21011213329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505606661 + 10505606662.

It is an arithmetic number, because the mean of its divisors is an integer number (10505606662).

Almost surely, 2^21011213323 is an apocalyptic number.

21011213323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011213323 is an equidigital number, since it uses as much as digits as its factorization.

21011213323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21011213323 its reverse (32331211012), we get a palindrome (53342424335).

The spelling of 21011213323 in words is "twenty-one billion, eleven million, two hundred thirteen thousand, three hundred twenty-three".