21302331321320 has 128 divisors (see below), whose sum is σ = 56275744757760. Its totient is φ = 7104005544960.

The previous prime is 21302331321277. The next prime is 21302331321331. The reversal of 21302331321320 is 2312313320312.

It is a self number, because there is not a number n which added to its sum of digits gives 21302331321320.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32485490 + ... + 33134750.

It is an arithmetic number, because the mean of its divisors is an integer number (439654255920).

Almost surely, 2^{21302331321320} is an apocalyptic number.

21302331321320 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 21302331321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28137872378880).

21302331321320 is an abundant number, since it is smaller than the sum of its proper divisors (34973413436440).

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

21302331321320 is a wasteful number, since it uses less digits than its factorization.

21302331321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652483 (or 652479 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21302331321320 its reverse (2312313320312), we get a palindrome (23614644641632).

The spelling of 21302331321320 in words is "twenty-one trillion, three hundred two billion, three hundred thirty-one million, three hundred twenty-one thousand, three hundred twenty".