21003032304 has 60 divisors (see below), whose sum is σ = 59107768200. Its totient is φ = 6961890432.

The previous prime is 21003032293. The next prime is 21003032327. The reversal of 21003032304 is 40323030012.

It is a super-2 number, since 2×21003032304² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381639 + ... + 433190.

It is an arithmetic number, because the mean of its divisors is an integer number (985129470).

Almost surely, 2^21003032304 is an apocalyptic number.

21003032304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21003032304 is an abundant number, since it is smaller than the sum of its proper divisors (38104735896).

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

21003032304 is a wasteful number, since it uses less digits than its factorization.

21003032304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815022 (or 815013 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21003032304 its reverse (40323030012), we get a palindrome (61326062316).

The spelling of 21003032304 in words is "twenty-one billion, three million, thirty-two thousand, three hundred four".