21223312110 has 384 divisors, whose sum is σ = 76103000064. Its totient is φ = 3960161280.

The previous prime is 21223312093. The next prime is 21223312171. The reversal of 21223312110 is 1121332212.

21223312110 is a `hidden beast` number, since 2 + 122 + 331 + 211 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3330147 + ... + 3336513.

It is an arithmetic number, because the mean of its divisors is an integer number (198184896).

Almost surely, 2^21223312110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223312110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38051500032).

21223312110 is an abundant number, since it is smaller than the sum of its proper divisors (54879687954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223312110 is a wasteful number, since it uses less digits than its factorization.

21223312110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448 (or 6445 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21223312110 its reverse (1121332212), we get a palindrome (22344644322).

It can be divided in two parts, 21223 and 312110, that added together give a palindrome (333333).

The spelling of 21223312110 in words is "twenty-one billion, two hundred twenty-three million, three hundred twelve thousand, one hundred ten".