21102043323 has 4 divisors (see below), whose sum is σ = 28136057768. Its totient is φ = 14068028880.

The previous prime is 21102043307. The next prime is 21102043327. The reversal of 21102043323 is 32334020112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21102043323 - 2⁴ = 21102043307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102043323.

It is not an unprimeable number, because it can be changed into a prime (21102043327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517007218 + ... + 3517007223.

It is an arithmetic number, because the mean of its divisors is an integer number (7034014442).

Almost surely, 2^21102043323 is an apocalyptic number.

21102043323 is a deficient number, since it is larger than the sum of its proper divisors (7034014445).

21102043323 is an equidigital number, since it uses as much as digits as its factorization.

21102043323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034014444.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21102043323 its reverse (32334020112), we get a palindrome (53436063435).

The spelling of 21102043323 in words is "twenty-one billion, one hundred two million, forty-three thousand, three hundred twenty-three".