21210203312 has 40 divisors (see below), whose sum is σ = 42505925280. Its totient is φ = 10245957120.

The previous prime is 21210203257. The next prime is 21210203347. The reversal of 21210203312 is 21330201212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89387 + ... + 224522.

It is an arithmetic number, because the mean of its divisors is an integer number (1062648132).

Almost surely, 2^21210203312 is an apocalyptic number.

It is an amenable number.

21210203312 is an abundant number, since it is smaller than the sum of its proper divisors (21295721968).

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

21210203312 is a wasteful number, since it uses less digits than its factorization.

21210203312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314061 (or 314055 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21210203312 its reverse (21330201212), we get a palindrome (42540404524).

The spelling of 21210203312 in words is "twenty-one billion, two hundred ten million, two hundred three thousand, three hundred twelve".