21021110223 has 8 divisors (see below), whose sum is σ = 28028862000. Its totient is φ = 14013715968.

The previous prime is 21021110197. The next prime is 21021110239. The reversal of 21021110223 is 32201112012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21021110223 - 2¹³ = 21021102031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021110293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113793 + ... + 234501.

It is an arithmetic number, because the mean of its divisors is an integer number (3503607750).

Almost surely, 2^21021110223 is an apocalyptic number.

21021110223 is a deficient number, since it is larger than the sum of its proper divisors (7007751777).

21021110223 is a wasteful number, since it uses less digits than its factorization.

21021110223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178761.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21021110223 its reverse (32201112012), we get a palindrome (53222222235).

The spelling of 21021110223 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, two hundred twenty-three".