21110223204 has 36 divisors (see below), whose sum is σ = 60985089984. Its totient is φ = 6031492272.

The previous prime is 21110223203. The next prime is 21110223209. The reversal of 21110223204 is 40232201112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (21110223203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41885112 + ... + 41885615.

Almost surely, 2^21110223204 is an apocalyptic number.

It is an amenable number.

21110223204 is an abundant number, since it is smaller than the sum of its proper divisors (39874866780).

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

21110223204 is a wasteful number, since it uses less digits than its factorization.

21110223204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83770744 (or 83770739 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21110223204 its reverse (40232201112), we get a palindrome (61342424316).

The spelling of 21110223204 in words is "twenty-one billion, one hundred ten million, two hundred twenty-three thousand, two hundred four".