21203321312 has 24 divisors (see below), whose sum is σ = 42632212896. Its totient is φ = 10376092672.

The previous prime is 21203321309. The next prime is 21203321327. The reversal of 21203321312 is 21312330212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7047473 + ... + 7050480.

It is an arithmetic number, because the mean of its divisors is an integer number (1776342204).

Almost surely, 2^21203321312 is an apocalyptic number.

It is an amenable number.

21203321312 is an abundant number, since it is smaller than the sum of its proper divisors (21428891584).

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

21203321312 is a wasteful number, since it uses less digits than its factorization.

21203321312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14098010 (or 14098002 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21203321312 its reverse (21312330212), we get a palindrome (42515651524).

The spelling of 21203321312 in words is "twenty-one billion, two hundred three million, three hundred twenty-one thousand, three hundred twelve".