21333221304 has 32 divisors (see below), whose sum is σ = 54008160000. Its totient is φ = 7021059552.

The previous prime is 21333221293. The next prime is 21333221321. The reversal of 21333221304 is 40312233312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5623954 + ... + 5627745.

It is an arithmetic number, because the mean of its divisors is an integer number (1687755000).

Almost surely, 2^21333221304 is an apocalyptic number.

21333221304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21333221304 is an abundant number, since it is smaller than the sum of its proper divisors (32674938696).

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

21333221304 is a wasteful number, since it uses less digits than its factorization.

21333221304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11251787 (or 11251783 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21333221304 its reverse (40312233312), we get a palindrome (61645454616).

The spelling of 21333221304 in words is "twenty-one billion, three hundred thirty-three million, two hundred twenty-one thousand, three hundred four".