21103103232 has 144 divisors (see below), whose sum is σ = 63429898560. Its totient is φ = 6918912000.

The previous prime is 21103103213. The next prime is 21103103237. The reversal of 21103103232 is 23230130112.

21103103232 is a `hidden beast` number, since 21 + 10 + 310 + 323 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103103237) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 396607 + ... + 446657.

Almost surely, 2^21103103232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103103232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31714949280).

21103103232 is an abundant number, since it is smaller than the sum of its proper divisors (42326795328).

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

21103103232 is an equidigital number, since it uses as much as digits as its factorization.

21103103232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50137 (or 50117 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21103103232 its reverse (23230130112), we get a palindrome (44333233344).

The spelling of 21103103232 in words is "twenty-one billion, one hundred three million, one hundred three thousand, two hundred thirty-two".