21212022304 has 144 divisors (see below), whose sum is σ = 47775057120. Its totient is φ = 9192268800.

The previous prime is 21212022301. The next prime is 21212022373. The reversal of 21212022304 is 40322021212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212022301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24693427 + ... + 24694285.

It is an arithmetic number, because the mean of its divisors is an integer number (331771230).

Almost surely, 2^21212022304 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 21212022304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23887528560).

21212022304 is an abundant number, since it is smaller than the sum of its proper divisors (26563034816).

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

21212022304 is a wasteful number, since it uses less digits than its factorization.

21212022304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21212022304 its reverse (40322021212), we get a palindrome (61534043516).

The spelling of 21212022304 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, three hundred four".