21104302212 has 144 divisors (see below), whose sum is σ = 64241049600. Its totient is φ = 5706728640.

The previous prime is 21104302207. The next prime is 21104302213. The reversal of 21104302212 is 21220340112.

It is a happy number.

21104302212 is a `hidden beast` number, since 2 + 1 + 10 + 430 + 221 + 2 = 666.

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 (21104302213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7328989 + ... + 7331867.

It is an arithmetic number, because the mean of its divisors is an integer number (446118400).

Almost surely, 2^21104302212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21104302212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32120524800).

21104302212 is an abundant number, since it is smaller than the sum of its proper divisors (43136747388).

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

21104302212 is a wasteful number, since it uses less digits than its factorization.

21104302212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446 (or 4441 counting only the distinct ones).

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

Adding to 21104302212 its reverse (21220340112), we get a palindrome (42324642324).

The spelling of 21104302212 in words is "twenty-one billion, one hundred four million, three hundred two thousand, two hundred twelve".