21015002304 has 84 divisors (see below), whose sum is σ = 60289857576. Its totient is φ = 6998704128.

The previous prime is 21015002297. The next prime is 21015002311. The reversal of 21015002304 is 40320051012.

21015002304 is a `hidden beast` number, since 210 + 150 + 0 + 2 + 304 = 666.

It is an interprime number because it is at equal distance from previous prime (21015002297) and next prime (21015002311).

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

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 648307 + ... + 679949.

Almost surely, 2^21015002304 is an apocalyptic number.

21015002304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21015002304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30144928788).

21015002304 is an abundant number, since it is smaller than the sum of its proper divisors (39274855272).

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

21015002304 is a wasteful number, since it uses less digits than its factorization.

21015002304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32814 (or 32801 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21015002304 its reverse (40320051012), we get a palindrome (61335053316).

The spelling of 21015002304 in words is "twenty-one billion, fifteen million, two thousand, three hundred four".