21303203212 has 6 divisors (see below), whose sum is σ = 37280605628. Its totient is φ = 10651601604.

The previous prime is 21303203203. The next prime is 21303203231. The reversal of 21303203212 is 21230230312.

It is a super-3 number, since 3×21303203212³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21303203212.

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 as a sum of consecutive naturals, namely, 2662900398 + ... + 2662900405.

Almost surely, 2^21303203212 is an apocalyptic number.

It is an amenable number.

21303203212 is a deficient number, since it is larger than the sum of its proper divisors (15977402416).

21303203212 is a wasteful number, since it uses less digits than its factorization.

21303203212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325800807 (or 5325800805 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21303203212 its reverse (21230230312), we get a palindrome (42533433524).

The spelling of 21303203212 in words is "twenty-one billion, three hundred three million, two hundred three thousand, two hundred twelve".