21204033212 has 24 divisors (see below), whose sum is σ = 39069114000. Its totient is φ = 10041687936.

The previous prime is 21204033199. The next prime is 21204033251. The reversal of 21204033212 is 21233040212.

It is a super-2 number, since 2×21204033212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323318 + ... + 383330.

It is an arithmetic number, because the mean of its divisors is an integer number (1627879750).

Almost surely, 2^21204033212 is an apocalyptic number.

It is an amenable number.

21204033212 is a deficient number, since it is larger than the sum of its proper divisors (17865080788).

21204033212 is a wasteful number, since it uses less digits than its factorization.

21204033212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64685 (or 64683 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21204033212 its reverse (21233040212), we get a palindrome (42437073424).

The spelling of 21204033212 in words is "twenty-one billion, two hundred four million, thirty-three thousand, two hundred twelve".