21210303440320 has 224 divisors, whose sum is σ = 51756138743040. Its totient is φ = 8276731330560.

The previous prime is 21210303440303. The next prime is 21210303440329. The reversal of 21210303440320 is 2304430301212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210303440329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1406231499 + ... + 1406246581.

Almost surely, 2^{21210303440320} is an apocalyptic number.

21210303440320 is a gapful number since it is divisible by the number (20) 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 21210303440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25878069371520).

21210303440320 is an abundant number, since it is smaller than the sum of its proper divisors (30545835302720).

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

21210303440320 is a wasteful number, since it uses less digits than its factorization.

21210303440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15723 (or 15713 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21210303440320 its reverse (2304430301212), we get a palindrome (23514733741532).

The spelling of 21210303440320 in words is "twenty-one trillion, two hundred ten billion, three hundred three million, four hundred forty thousand, three hundred twenty".