21032313223 has 4 divisors (see below), whose sum is σ = 21946761648. Its totient is φ = 20117864800.

The previous prime is 21032313217. The next prime is 21032313251. The reversal of 21032313223 is 32231323012.

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 21032313223 - 2⁹ = 21032312711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21032313194 and 21032313203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032314223) 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, 457224178 + ... + 457224223.

It is an arithmetic number, because the mean of its divisors is an integer number (5486690412).

Almost surely, 2^21032313223 is an apocalyptic number.

21032313223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21032313223 is a deficient number, since it is larger than the sum of its proper divisors (914448425).

21032313223 is an equidigital number, since it uses as much as digits as its factorization.

21032313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914448424.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21032313223 its reverse (32231323012), we get a palindrome (53263636235).

The spelling of 21032313223 in words is "twenty-one billion, thirty-two million, three hundred thirteen thousand, two hundred twenty-three".