21203110223 has 4 divisors (see below), whose sum is σ = 21397634280. Its totient is φ = 21008586168.

The previous prime is 21203110219. The next prime is 21203110273. The reversal of 21203110223 is 32201130212.

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 21203110223 - 2² = 21203110219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203110213) 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, 97261865 + ... + 97262082.

It is an arithmetic number, because the mean of its divisors is an integer number (5349408570).

Almost surely, 2^21203110223 is an apocalyptic number.

21203110223 is a deficient number, since it is larger than the sum of its proper divisors (194524057).

21203110223 is a wasteful number, since it uses less digits than its factorization.

21203110223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194524056.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21203110223 its reverse (32201130212), we get a palindrome (53404240435).

The spelling of 21203110223 in words is "twenty-one billion, two hundred three million, one hundred ten thousand, two hundred twenty-three".