21203032223 has 4 divisors (see below), whose sum is σ = 21204043560. Its totient is φ = 21202020888.

The previous prime is 21203032199. The next prime is 21203032231. The reversal of 21203032223 is 32223030212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203032223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203032195 and 21203032204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203032243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473540 + ... + 516377.

It is an arithmetic number, because the mean of its divisors is an integer number (5301010890).

Almost surely, 2^21203032223 is an apocalyptic number.

21203032223 is a deficient number, since it is larger than the sum of its proper divisors (1011337).

21203032223 is an equidigital number, since it uses as much as digits as its factorization.

21203032223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011336.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21203032223 its reverse (32223030212), we get a palindrome (53426062435).

The spelling of 21203032223 in words is "twenty-one billion, two hundred three million, thirty-two thousand, two hundred twenty-three".