21212002204 has 24 divisors (see below), whose sum is σ = 37191314048. Its totient is φ = 10585935360.

The previous prime is 21212002193. The next prime is 21212002261. The reversal of 21212002204 is 40220021212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7423144 + ... + 7426000.

Almost surely, 2^21212002204 is an apocalyptic number.

It is an amenable number.

21212002204 is a deficient number, since it is larger than the sum of its proper divisors (15979311844).

21212002204 is a wasteful number, since it uses less digits than its factorization.

21212002204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725 (or 5723 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21212002204 its reverse (40220021212), we get a palindrome (61432023416).

The spelling of 21212002204 in words is "twenty-one billion, two hundred twelve million, two thousand, two hundred four".