21303220312320 has 72 divisors (see below), whose sum is σ = 68037159884736. Its totient is φ = 5680858748928.

The previous prime is 21303220312307. The next prime is 21303220312327. The reversal of 21303220312320 is 2321302230312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21303220312327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2773852972 + ... + 2773860651.

Almost surely, 2^{21303220312320} is an apocalyptic number.

21303220312320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303220312320 is an abundant number, since it is smaller than the sum of its proper divisors (46733939572416).

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

21303220312320 is an equidigital number, since it uses as much as digits as its factorization.

21303220312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5547713647 (or 5547713633 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21303220312320 its reverse (2321302230312), we get a palindrome (23624522542632).

The spelling of 21303220312320 in words is "twenty-one trillion, three hundred three billion, two hundred twenty million, three hundred twelve thousand, three hundred twenty".