21355304412 has 36 divisors (see below), whose sum is σ = 53956898520. Its totient is φ = 6570862272.

The previous prime is 21355304387. The next prime is 21355304417. The reversal of 21355304412 is 21440355312.

It is a self number, because there is not a number n which added to its sum of digits gives 21355304412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355304417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5263087 + ... + 5267142.

Almost surely, 2^21355304412 is an apocalyptic number.

It is an amenable number.

21355304412 is an abundant number, since it is smaller than the sum of its proper divisors (32601594108).

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

21355304412 is a wasteful number, since it uses less digits than its factorization.

21355304412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530262 (or 10530247 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21355304412 its reverse (21440355312), we get a palindrome (42795659724).

The spelling of 21355304412 in words is "twenty-one billion, three hundred fifty-five million, three hundred four thousand, four hundred twelve".