21523303223 has 4 divisors (see below), whose sum is σ = 21524421888. Its totient is φ = 21522184560.

The previous prime is 21523303213. The next prime is 21523303231. The reversal of 21523303223 is 32230332512.

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

It is a cyclic number.

It is not a de Polignac number, because 21523303223 - 2⁶ = 21523303159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21523303192 and 21523303201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523303213) 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 in 3 ways as a sum of consecutive naturals, for example, 529958 + ... + 569123.

It is an arithmetic number, because the mean of its divisors is an integer number (5381105472).

Almost surely, 2^21523303223 is an apocalyptic number.

21523303223 is a deficient number, since it is larger than the sum of its proper divisors (1118665).

21523303223 is a wasteful number, since it uses less digits than its factorization.

21523303223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118664.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21523303223 its reverse (32230332512), we get a palindrome (53753635735).

The spelling of 21523303223 in words is "twenty-one billion, five hundred twenty-three million, three hundred three thousand, two hundred twenty-three".