21223012110 has 32 divisors (see below), whose sum is σ = 50975207712. Its totient is φ = 5655027840.

The previous prime is 21223012093. The next prime is 21223012159. The reversal of 21223012110 is 1121032212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223012110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238681 + ... + 315300.

It is an arithmetic number, because the mean of its divisors is an integer number (1592975241).

Almost surely, 2^21223012110 is an apocalyptic number.

21223012110 is an abundant number, since it is smaller than the sum of its proper divisors (29752195602).

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

21223012110 is a wasteful number, since it uses less digits than its factorization.

21223012110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555268.

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

Adding to 21223012110 its reverse (1121032212), we get a palindrome (22344044322).

The spelling of 21223012110 in words is "twenty-one billion, two hundred twenty-three million, twelve thousand, one hundred ten".