21213300204 has 18 divisors (see below), whose sum is σ = 53622508940. Its totient is φ = 7071100056.

The previous prime is 21213300181. The next prime is 21213300221. The reversal of 21213300204 is 40200331212.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 294629134 + ... + 294629205.

Almost surely, 2^21213300204 is an apocalyptic number.

It is an amenable number.

21213300204 is an abundant number, since it is smaller than the sum of its proper divisors (32409208736).

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

21213300204 is a wasteful number, since it uses less digits than its factorization.

21213300204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589258349 (or 589258344 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21213300204 its reverse (40200331212), we get a palindrome (61413631416).

The spelling of 21213300204 in words is "twenty-one billion, two hundred thirteen million, three hundred thousand, two hundred four".