21203303312 has 40 divisors (see below), whose sum is σ = 43671392352. Its totient is φ = 9938240000.

The previous prime is 21203303309. The next prime is 21203303321. The reversal of 21203303312 is 21330330212.

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, 87014 + ... + 223557.

Almost surely, 2^21203303312 is an apocalyptic number.

It is an amenable number.

21203303312 is an abundant number, since it is smaller than the sum of its proper divisors (22468089040).

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

21203303312 is a wasteful number, since it uses less digits than its factorization.

21203303312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310847 (or 310841 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21203303312 its reverse (21330330212), we get a palindrome (42533633524).

The spelling of 21203303312 in words is "twenty-one billion, two hundred three million, three hundred three thousand, three hundred twelve".