21203031232 has 28 divisors (see below), whose sum is σ = 43525622880. Its totient is φ = 10235945216.

The previous prime is 21203031173. The next prime is 21203031257. The reversal of 21203031232 is 23213030212.

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 in 3 ways as a sum of consecutive naturals, for example, 5710168 + ... + 5713879.

Almost surely, 2^21203031232 is an apocalyptic number.

It is an amenable number.

21203031232 is an abundant number, since it is smaller than the sum of its proper divisors (22322591648).

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

21203031232 is a wasteful number, since it uses less digits than its factorization.

21203031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11424088 (or 11424078 counting only the distinct ones).

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

Adding to 21203031232 its reverse (23213030212), we get a palindrome (44416061444).

The spelling of 21203031232 in words is "twenty-one billion, two hundred three million, thirty-one thousand, two hundred thirty-two".