21203022223 has 4 divisors (see below), whose sum is σ = 21209819008. Its totient is φ = 21196225440.

The previous prime is 21203022221. The next prime is 21203022277. The reversal of 21203022223 is 32222030212.

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 21203022223 - 2¹ = 21203022221 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 21203022223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203022221) 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, 3393711 + ... + 3399952.

It is an arithmetic number, because the mean of its divisors is an integer number (5302454752).

Almost surely, 2^21203022223 is an apocalyptic number.

21203022223 is a deficient number, since it is larger than the sum of its proper divisors (6796785).

21203022223 is an equidigital number, since it uses as much as digits as its factorization.

21203022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6796784.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21203022223 its reverse (32222030212), we get a palindrome (53425052435).

The spelling of 21203022223 in words is "twenty-one billion, two hundred three million, twenty-two thousand, two hundred twenty-three".