21210321223 has 32 divisors (see below), whose sum is σ = 27025004160. Its totient is φ = 16191221760.

The previous prime is 21210321203. The next prime is 21210321233. The reversal of 21210321223 is 32212301212.

It is not a de Polignac number, because 21210321223 - 2⁵ = 21210321191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210321223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210321203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5637663 + ... + 5641423.

It is an arithmetic number, because the mean of its divisors is an integer number (844531380).

Almost surely, 2^21210321223 is an apocalyptic number.

21210321223 is a deficient number, since it is larger than the sum of its proper divisors (5814682937).

21210321223 is a wasteful number, since it uses less digits than its factorization.

21210321223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5947.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210321223 its reverse (32212301212), we get a palindrome (53422622435).

The spelling of 21210321223 in words is "twenty-one billion, two hundred ten million, three hundred twenty-one thousand, two hundred twenty-three".