21330351043320 has 768 divisors, whose sum is σ = 75137838088320. Its totient is φ = 4823680942080.

The previous prime is 21330351043319. The next prime is 21330351043321. The reversal of 21330351043320 is 2334015303312.

It is an interprime number because it is at equal distance from previous prime (21330351043319) and next prime (21330351043321).

It is a super-2 number, since 2×21330351043320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330351043321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 19515416694 + ... + 19515417786.

Almost surely, 2^{21330351043320} is an apocalyptic number.

21330351043320 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 21330351043320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37568919044160).

21330351043320 is an abundant number, since it is smaller than the sum of its proper divisors (53807487045000).

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

21330351043320 is a wasteful number, since it uses less digits than its factorization.

21330351043320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1761 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 30.

Adding to 21330351043320 its reverse (2334015303312), we get a palindrome (23664366346632).

The spelling of 21330351043320 in words is "twenty-one trillion, three hundred thirty billion, three hundred fifty-one million, forty-three thousand, three hundred twenty".