21303064464 has 120 divisors (see below), whose sum is σ = 60649659840. Its totient is φ = 6438516480.

The previous prime is 21303064403. The next prime is 21303064469. The reversal of 21303064464 is 46446030312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21303064469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2301157 + ... + 2310395.

It is an arithmetic number, because the mean of its divisors is an integer number (505413832).

Almost surely, 2^21303064464 is an apocalyptic number.

21303064464 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 21303064464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30324829920).

21303064464 is an abundant number, since it is smaller than the sum of its proper divisors (39346595376).

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

21303064464 is a wasteful number, since it uses less digits than its factorization.

21303064464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669 (or 9652 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 21303064464 its reverse (46446030312), we get a palindrome (67749094776).

The spelling of 21303064464 in words is "twenty-one billion, three hundred three million, sixty-four thousand, four hundred sixty-four".