21001204032 has 112 divisors (see below), whose sum is σ = 58557322560. Its totient is φ = 6624350208.

The previous prime is 21001204027. The next prime is 21001204043. The reversal of 21001204032 is 23040210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3765598 + ... + 3771170.

Almost surely, 2^21001204032 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 21001204032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29278661280).

21001204032 is an abundant number, since it is smaller than the sum of its proper divisors (37556118528).

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

21001204032 is a wasteful number, since it uses less digits than its factorization.

21001204032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640 (or 6630 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21001204032 its reverse (23040210012), we get a palindrome (44041414044).

The spelling of 21001204032 in words is "twenty-one billion, one million, two hundred four thousand, thirty-two".