21206633304 has 16 divisors (see below), whose sum is σ = 53016583320. Its totient is φ = 7068877760.

The previous prime is 21206633291. The next prime is 21206633309. The reversal of 21206633304 is 40333660212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21206633309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441804837 + ... + 441804884.

Almost surely, 2^21206633304 is an apocalyptic number.

21206633304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21206633304 is an abundant number, since it is smaller than the sum of its proper divisors (31809950016).

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

21206633304 is a wasteful number, since it uses less digits than its factorization.

21206633304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883609730 (or 883609726 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The spelling of 21206633304 in words is "twenty-one billion, two hundred six million, six hundred thirty-three thousand, three hundred four".