21000331232 has 24 divisors (see below), whose sum is σ = 41660016552. Its totient is φ = 10420009600.

The previous prime is 21000331199. The next prime is 21000331259. The reversal of 21000331232 is 23213300012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000331232.

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, 2500619 + ... + 2509002.

It is an arithmetic number, because the mean of its divisors is an integer number (1735834023).

Almost surely, 2^21000331232 is an apocalyptic number.

It is an amenable number.

21000331232 is a deficient number, since it is larger than the sum of its proper divisors (20659685320).

21000331232 is a wasteful number, since it uses less digits than its factorization.

21000331232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009762 (or 5009754 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21000331232 its reverse (23213300012), we get a palindrome (44213631244).

The spelling of 21000331232 in words is "twenty-one billion, three hundred thirty-one thousand, two hundred thirty-two".